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Corbin Burnes To Undergo Tommy John Surgery

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Diamondbacks manager Torey Lovullo has informed members of the media that right-hander Corbin Burnes will undergo Tommy John surgery. Burnes will therefore miss the remainder of this season and possibly the entire 2026 campaign as well. Radio broadcaster Chris Garagiola was among those to pass the info along. Burnes is already on the 15-day injured list but will be transferred to the 60-day as soon as the club needs a roster spot.

The news is devastating but unsurprising. Burnes was pitching on Sunday when he called the training staff out from the dugout. He departed that game and the club later announced that he was experiencing elbow discomfort. He went for various medical opinions in the following days but it seems the worst-case scenario could not be avoided, so he’ll go under the knife. Given that Tommy John surgery usually requires 14 to 18 months of recovery time, Burnes is definitely out for the rest of 2025. A return in late in 2026 is possible but can’t be guaranteed.

Burnes is well known as one of the best pitchers in the sport. He won a Cy Young Award while pitching with the Brewers in 2021. He posted a 2.43 earned run average in 167 innings that year. He struck out 35.6% of opponents, only gave out walks at a 5.2% clip and got grounders on 48.8% of balls in play.

His results have backed up a bit since then but he’s still been excellent. Over the next three years, his strikeout rate continued to fall but it didn’t prevent his overall run prevention much. His ERA finished around 3.00 in each season from 2022 to 2024, even though his strikeout rate fell to 30.5%, 25.5% and 23.1% in those seasons.

He was one of the top free agents in the most recent offseason. MLBTR placed him second in the class, behind only Juan Soto, predicting Burnes could land a $200MM contract over seven years. He naturally fielded a lot of interest, with clubs such as the Orioles, Blue Jays and Giants among those who were connected to him most often.

In late December, he finally picked a new team. Arizona was a surprising destination since the club already had a number of rotation options and wasn’t heavily connected to the starting pitching market. But Burnes is an Arizona native and reportedly wanted to be close to his family, so the two sides made it work. The six-year deal guarantees Burnes $210MM, though with $64MM of that deferred into the next decade. It also affords him the opportunity to opt out after the 2026 season.

The Diamondbacks had made a number of investments in their rotation in recent years but this was the largest by far. Going into 2024, they gave Eduardo Rodríguez a four-year, $80MM deal and Jordan Montgomery also got a one-year, $25MM guarantee plus an easily-attainable vesting option.

Despite the heavy amount of investment in starting pitching, the Arizona rotation hasn’t been a strength. That was true even before this Burnes news, something that MLBTR’s Anthony Franco recently took a look at in a post for Front Office subscribers.

Losing Burnes for the rest of the year will only compound the problem. Montgomery himself required Tommy John surgery before the season started, so he’s already been out of action all year. Rodríguez has a 7.05 ERA in nine starts. He went on the IL in mid-May due to shoulder inflammation and was reinstated today.

Despite having one of the best lineups in baseball, the Arizona pitching has contributed to a fairly disappointing season so far. A recent four-game win streak has got them back to .500, but their 31-31 record still has them 3.5 games out of a playoff spot at the moment. They will have to try to climb back into the race without Burnes. Their current rotation consists of Rodríguez, Zac Gallen, Merrill Kelly, Brandon Pfaadt and Ryne Nelson. Kelly is having a good year but Gallen, Pfaadt and Rodríguez are all struggling. Nelson has been in a swing role and is only now taking up a rotation spot in the wake of the injuries.

With the club hovering around contention, decisions will have to be made about the club’s deadline plans. If they fall back in the standings, they have a number of impending free agents and could have a lot to sell. That includes Gallen, Kelly, Eugenio Suárez and Josh Naylor. Montgomery is also an impending free agent but naturally has no trade value since he’s out for the year. Though if the Snakes can hang in there, adding at the deadline could obviously be the move.

Those impending free agencies and the Burnes surgery will also lead to questions about the 2026 rotation. As of now, it consists of Pfaadt, Rodríguez and Nelson. There are some prospects who could potentially take up roles but it’s clearly a very different picture to the imperfect group they have now.

Turning to the Burnes opt-out, it now seems incredibly unlikely that he triggers it. Though he could come back late next year, that will likely be for a handful of starts at most. It would be hard for him to build up enough of a platform to turn down the four years and $140MM (with deferrals) left on the deal.

That’s a largely moot point for the future. For today, the takeaway is that it’s real bad news for the Diamondbacks. Subtracting Burnes blows a big hole in their rotation right now, while the club is trying to salvage the season, and into the long-term as well.

Photos courtesy of Mark J. Rebilas and Allan Henry, Imagn Images

The Diamondbacks’ Surprisingly Middling Rotation

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Few teams have more aggressively added veteran rotation help over the past two years than the Diamondbacks. As shown on MLBTR's Contract Tracker, 15 free agent starting pitchers have signed for at least a $20MM average annual value since the start of the 2023-24 offseason. The D-Backs have been responsible for three of them.

If we exclude Shohei Ohtani, who was obviously signed more for his bat,  Arizona is the only team to sign three such contracts over the past two winters. The Dodgers (Yoshinobu Yamamoto and Blake Snell) are the only other club that has signed more than one.

Arizona began with a four-year, $80MM contract for Eduardo Rodriguez. That was a sizable investment for their market size but not one that took too many people by surprise. They finally snapped Jordan Montgomery's extended free agent stay with a one-year, $25MM guarantee and an easily achievable vesting option that pushed their investment close to $50MM over two seasons.

The true shocker came last winter, when they emerged out of nowhere as the landing spot for Corbin Burnes, who wanted to pitch close to his Arizona home. He probably left some earnings upside on the table, but it still took a six-year commitment worth $210MM (with a net present value closer to $194MM after adjusting for deferred money).

They've added those big-name arms to an in-house starting pitching group that included Zac Gallen, Merrill Kelly and Brandon Pfaadt. Maybe they didn't match the depth of some other clubs, but their top six to seven starters look exceptionally formidable. This should be one of the best rotations in MLB.

And yet, for two years running, it hasn't been particularly close to that.

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Diamondbacks Place Eduardo Rodríguez On IL With Shoulder Inflammation

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The Diamondbacks announced today that left-hander Eduardo Rodríguez has been placed on the 15-day injured list, retroactive to May 15th, with left shoulder inflammation. Lefty Joe Mantiply has also been optioned to Triple-A Reno. To take those two spots, the club has recalled right-hander Scott McGough and selected the contract of righty Christian Montes De Oca. The 40-man roster had two vacancies due to Garrett Hampson and José Castillo being designated for assignment earlier this week. Per John Gambadoro of Arizona Sports 98.7 FM Phoenix, righty Ryne Nelson will take E-Rod’s rotation spot, taking the ball on Tuesday.

There haven’t been a lot of publicly reported details about Rodríguez or his injury, but it’s possible he was feeling it last time out. He started on Wednesday against the Giants but wasn’t very effective. He allowed four earned runs in four innings and was pulled after throwing just 76 pitches. The velocity on most of his offerings was down about one mile per hour relative to his previous start. Perhaps the club will provide more information but it seems the lefty will need to miss at least a couple of starts.

That will give Nelson a chance to retake a rotation spot, at least for now. He logged 150 2/3 innings for the Snakes last year, mostly as a starter. He had a 4.24 earned run average, 20% strikeout rate and 5.4% walk rate.

Despite those strong numbers, he got pushed down the depth chart when the Snakes signed Corbin Burnes in the offseason. Burnes joined a rotation group next to Zac Gallen, Merrill Kelly, Brandon Pfaadt, Jordan Montgomery and Rodríguez. Montgomery required Tommy John surgery in March, but Nelson was still unable to get a rotation job.

He opened the year in a long relief role and has thrown 26 1/3 innings with a 5.13 ERA, but better peripherals. He has struck out 25% of batters faced while giving out walks at an 8.9% clip. A low 62.5% strand rate is not doing him favors, perhaps why his FIP is 3.71 and his SIERA at 3.45.

Kelly, Gallen and Montgomery are all free agents at the end of this year, while Burnes has an opt-out after 2026. Nelson is under club control through 2028 and could perhaps earn a long-term rotation spot with some strong results this year. Though if Rodríguez returns in relatively short order, it’s possible Nelson finds himself back in the bullpen again.

Montes De Oca, 25, gets the call to the big leagues for the first time. An international amateur signing out of the Dominican Republic, he has 181 1/3 minor league innings under his belt to this point in his career. In that time, he has a 4.17 ERA, 25.2% strikeout rate and 8.2% walk rate. He’s out to a good start this year, despite pitching in the hitter-friendly Pacific Coast League. In 19 Triple-A innings, he has a 2.37 ERA, 23.3% strikeout rate, 5.5% walk rate and 57.7% ground ball rate.

Photo courtesy of D. Ross Cameron, Imagn Images

D-backs Sticking To Five-Man Rotation

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The Diamondbacks’ surprise signing of Corbin Burnes further crowded a rotation that had at least six starters in the mix. While there’s been talk of a possible six-man rotation in Arizona since that Burnes deal, manager Torey Lovullo said at D-backs camp this week that team is not considering that at this point (link via Nick Piecoro of the Arizona Republic).

That leaves the Diamondbacks with seven starters for five spots: Burnes, Zac Gallen, Merrill Kelly, Eduardo Rodriguez, Brandon Pfaadt, Jordan Montgomery and Ryne Nelson. The first four are largely locked into place. Burnes and Gallen are Cy Young-caliber arms when healthy. Kelly has been a steady midrotation arm for the Snakes since signing out of the KBO in the 2018-19 offseason. Rodriguez’s first year in Arizona was marred by injury, but he’s signed three more years and has a lengthy track record.

Montgomery’s status in Arizona has been a talking point throughout the winter. The Diamondbacks signed him to a one-year, $25MM contract with a vesting $20MM player option for the 2025 season. The left-hander pitched enough to trigger that option but nowhere near well enough to decline it in favor of a return to the open market. Signing just days before Opening Day last season, Montgomery missed spring training, rushed through an accelerated ramp-up in Triple-A and never appeared to be himself. He pitched 117 innings but was rocked for a 6.23 earned run average with career-worst walk and strikeout rates.

D-backs owner Ken Kendrick called Montgomery’s performance out late in the season, publicly lamenting the role that he’d played in bringing the left-hander to his organization. “I brought it to (the front office’s) attention. I pushed for it,” Kendrick said in September. “They agreed to it. It wasn’t in our game plan. … And looking back, in hindsight, a horrible decision to have invested that money in a guy that performed as poorly as he did.”

Pfaadt, 26, would give the D-backs an upside arm at the back of the staff. The former top prospect hasn’t yet found his stride over a full big league season but has shown glimpses of the potential that made him so well regarded. He looked to have found his stride last year, logging a 3.98 ERA, 23% strikeout rate and 4.9% walk rate through his first 24 starts, but Pfaadt was hit hard in late August and for much of September. He mixed in one late-season gem — seven innings, one run, 12 strikeouts in Milwaukee — but even with that showing still posted an ERA north of 7.00 over his final eight starts. He finished the year at a 4.71 mark but did pile up 181 2/3 innings.

Nelson, who turned 27 in December, made 27 appearances this past season — 25 of them starts — and recorded 150 2/3 innings of 4.24 ERA ball. His 20% strikeout rate and 8.4% swinging-strike rate were below average (well below, with regard to the latter), but Nelson’s 5.4% walk rate was outstanding.

There are other options on the 40-man roster, but they’re likely to be viewed as depth candidates, barring a spring breakout. Yilber Diaz, Cristian Mena, Tommy Henry and Blake Walston are all on the 40-man roster and have all made their big league debuts, but they’d likely only be called upon in the event of multiple injuries — at least with the current roster construction.

Kendrick’s comments on Montgomery led to plenty of speculation about a potential trade of this winter, but no such deal has come to fruition. It’s still possible the D-backs could find a taker for a portion of the contract or swap him out for a comparably priced veteran on an underwater deal (e.g. Rhys Hoskins, Starling Marte), but for now, Montgomery will get a full spring buildup and look to bounce back from a dismal 2024 season.

If the D-backs can find some kind of trade that sheds a portion of the Montgomery money, any savings could be reallocated to other needs. Most notably, they’ve been in the market for a closer throughout the winter but have yet to add an established ninth-inning arm. Arizona’s payroll is projected for a franchise-record $195MM, per RosterResource. It’s not clear whether Kendrick is willing to push things further after already ponying up to sign Burnes (six years, $210MM), acquire Josh Naylor in a trade (one year, $10.9MM) and re-sign Randal Grichuk (one year, $5MM). Barring the signing of a veteran like David Robertson or Kyle Finnegan, the D-backs will look inward and lean on A.J. Puk, Justin Martinez and Kevin Ginkel as their top late-inning arms.

Diamondbacks Not Close To Any Pitching Trades

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The Diamondbacks’ surprise signing of Corbin Burnes added a new frontline arm to a rotation that was already operating at a surplus on paper.  Burnes joins Zac Gallen, Merrill Kelly, Eduardo Rodriguez, Jordan Montgomery, Brandon Pfaadt, and Ryne Nelson, giving the Snakes an enviably deep group of starting pitchers.  The D’backs had already been drawing trade interest in this group even before Burnes was added, but Nick Piecoro of the Arizona Republic reports that the Burnes signing wasn’t made with any other pitching swaps immediately on the horizon.

According to Piecoro, no “other deals [are] lined up or even close” involving Arizona’s pitchers, as the Diamondbacks will continue to take a measured view of the market.  A source tells Piecoro that the D’Backs will likely “spend the coming days fielding calls from teams still in the hunt for starters, including those that were in on Burnes.”  The D’Backs aren’t in any particular rush to complete a trade any time soon, as having more than a full rotation in place before New Year’s Eve gives the club plenty of time to figure out the best possible offer.

It also isn’t entirely out of the question that the Diamondbacks stand pat on their starters, especially if an injury emerges to a starter during their offseason training, or during Spring Training.  Kelly, Rodriguez, and Montgomery all missed significant time with injuries last season, so there is obvious value in having extra pitchers on hand should any more health issues create openings in the rotation.  Operating with a six-man rotation is also a possibility, in order to keep everyone healthy and fresh for what the D’Backs hope can be an extended run through the playoffs.

Given how the Burnes deal reportedly came together just within the last week when Burnes himself approached the D’Backs, it isn’t surprising that the signing wasn’t part of an immediate plan to re-model the pitching staff.  Such two-step transactions are usually hard to pull off, though the Diamondbacks were part of such a set of moves from the Guardians just last week — Arizona acquired Josh Naylor from the Guards, and Cleveland then signed Carlos Santana that same day to immediately fill Naylor’s spot as the everyday first baseman.

The fact that Burnes signed with a team that was seemingly already set for starting pitching gives GM Mike Hazen even more leverage in shopping his hurlers.  Such known Burnes suitors like the Orioles, Blue Jays, or Giants are still in need of pitching, to say nothing of the many other starter-needy clubs on the market that weren’t willing or able to meet Burnes’ asking price.

Nothing seems to have changed in terms of which starters are most prominently on Arizona’s trade block.  Gallen and Kelly are both free agents next winter but don’t seem likely to be dealt, as a team source told Piecoro that the team’s focus in on “trying to put the best team on the field in 2025.”  Nelson is controlled through the 2027 season and Pfaadt through the 2029 season, so the Diamondbacks would probably only move either if a longer-term asset (likely a position player) could be obtained in return.  The D’Backs might not mind moving the $66MM remaining on Rodriguez’s contract, but the club would certainly have to sell low and eat some of that money in the wake of E-Rod’s injury-plagued down year.

That leaves Montgomery as still the chief candidate to be dealt before Opening Day.  Montgomery’s trade value is also at a low ebb after his rough first year in Arizona, and his $22.5MM salary for the 2025 season.  Owner Ken Kendrick’s public criticism of Montgomery following the season only increased the probability that the left-hander would be pitching elsewhere next year, yet again, the Burnes signing gives the D’Backs some flexibility in this regard.  The Diamondbacks technically don’t have to trade Montgomery if an acceptable offer for another starter comes their way, and offers for Montgomery might improve if other teams become increasingly desperate to add pitching.

Diamondbacks’ Starters Drawing Trade Interest

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As free agent starters begin to find new homes — Blake Snell, Yusei Kikuchi, Frankie Montas, Matthew Boyd and Kyle Hendricks have all signed in the past two weeks — interest in the Diamondbacks’ collection of rotation arms has “started to pick up,” general manager Mike Hazen tells Nick Piecoro of the Arizona Republic. The D-backs have at least six starters on the roster at present: Zac Gallen, Merrill Kelly, Eduardo Rodriguez, Brandon Pfaadt, Ryne Nelson and Jordan Montgomery.

Of the six, Montgomery is the most obvious trade candidate, following a rough 2024 showing and owner Ken Kendrick’s public, verbal thrashing of the player. In October, Kendrick openly lamented ever pushing his front office to sign Montgomery late in the 2023-24 offseason, calling it a “horrible decision to have invested that money in a guy that performed as poorly as he did” and “our biggest mistake this season from a talent standpoint.” Montgomery unsurprisingly exercised a $22.5MM player option even after being called out by Kendrick — a straightforward decision for a pitcher coming off an injury-shortened year with career-worst marks in ERA (6.23), strikeout rate (15.6%) and walk rate (8.3%).

For all the focus placed on Montgomery’s struggles last year, the other veteran lefty signed by Arizona last offseason also fell well short of expectations. Rodriguez signed a four-year, $80MM pact with the Snakes but was limited to just 10 starts after opening the season on the injured list due to a shoulder strain. He pitched 50 innings of 5.04 ERA ball while showing diminished life on his four-seamer and sinker. Rodriguez is owed $20MM for the coming season, $21MM in 2026 and $19MM in 2027. He’s also guaranteed a $6MM buyout on a $17MM mutual option for the 2028 season — an option that could automatically vest based on his innings tallies in 2026-27. While Montgomery’s contract is underwater, the three years and $66MM remaining on Rodriguez’s pact very likely make him even harder to unload.

Any of  the other four arms in Arizona’s rotation would be hard to pry loose. Ace Zac Gallen is a Cy Young contender when healthy, evidenced by fifth- and third-place finishes in 2022 and 2023 balloting. He missed about a month of action with a hamstring strain in 2024 and flashed worse command than usual (relative to his excellent standards, anyhow), but any team would love to have the right-hander. He’s projected by MLBTR contributor Matt Swartz to earn $14.1MM in his final season of club control before becoming a free agent next winter. Gallen is not being shopped, to be clear. Hazen even chuckled at the mere notion of Gallen being a prominent trade candidate in a mid-November appearance on Arizona Sports 98.7’s Wolf & Luke Show (2:35 mark). That’s unlikely to stop other teams from trying.

Kelly, like Gallen, is a free agent next offseason. He missed more than three months in 2024 with a shoulder strain but was generally effective when healthy, logging a 4.03 ERA with a slightly below-average 21% strikeout rate and a strong 6.3% walk rate. Arizona made an easy call to exercise a $7MM club option on Kelly for the upcoming season.

Nelson and Pfaadt are both controllable and thus quite valuable to the Snakes. The 26-year-old Nelson is under club control for four more seasons and just tossed 150 2/3 innings with a 4.24 ERA, 20% strikeout rate and outstanding 5.4% walk rate in 2024. Those numbers are skewed by a slow start, but from July onward, Nelson posted a 3.05 ERA, 24.8 K% and 5.0 BB% in 82 2/3 frames. He’s not yet eligible for arbitration.

Pfaadt, also 26, paced the D-backs with 181 2/3 innings and 32 starts. His 4.71 ERA doesn’t stand out, but his 24.3% strikeout rate, 5.5% walk rate, 3.61 FIP and 3.65 SIERA are all far more encouraging. He might’ve worn down a bit late in the season as he pushed through that new career-high workload, as his worst months were August and September. A disproportionate amount of the damage against Pfaadt this season came in one nightmare September outing, wherein the Brewers tagged him for eight runs in just 1 2/3 innings. Lopping off even that one start would cause his season-long ERA to drop by nearly 40 points. Regardless, the former top prospect is a 2025 breakout candidate when considering his pedigree and rate stats that far outpace his pedestrian earned run average. Of the arms on the big league staff, he’s probably the most difficult for another team to acquire.

There’s depth even beyond that sextet. Right-hander Drey Jameson will be back from 2023 Tommy John surgery next year. He’s already had some big league success. There are another five starters on the 40-man roster and likely ticketed for Triple-A, all of whom have minor league options remaining and at least a bit of MLB experience: Yilber Diaz, Slade Cecconi, Blake Walston, Cristian Mena and Tommy Henry. Few organizations boast a stockpile of arms so deep.

All of that is to say — it’s hardly a surprise that clubs are calling the D-backs about their starters. The same is true of their outfielders, as Hazen already acknowledged a couple weeks back. Piecoro writes that (naturally) Montgomery is both the likeliest to move and the pitcher whom the team would most strongly prefer to deal. Hazen stated that Kendrick’s comments regarding the left-hander have “zero” impact on the urgency to trade him, though there’s likely some public-facing lip service at play there.

Piecoro adds that the D-backs would be willing to take on another contract of some note in return for Montgomery (if said player filled a roster need) or perhaps pursue more of a traditional salary dump, where they shed as much of the contract as possible for little to no return. Of note, Hazen suggested that if he’s to ultimately move Montgomery in deal that is primarily rooted in salary relief, the trade would need to come together before the bulk of quality free agents come off the board: “At some point, it doesn’t make sense because your pivot moves are picking at the edges rather than getting somebody (who is more of a target).”

Diamondbacks Select Adrian Del Castillo

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2:30pm: The Diamondbacks have officially announced these moves and others. Del Castillo has been selected and Moreno has been placed on the IL with a strained left adductor. They also reinstated left-hander Eduardo Rodríguez from the 60-day IL, a move that was reported last week. To activate Rodriguez, the club optioned right-hander Humberto Castellanos and transferred righty Bryce Jarvis to the 60-day IL. It was also reported last week that Jarvis is unlikely to return this year due to his sprained right elbow.

12:40pm: The Diamondbacks are going to place catcher Gabriel Moreno on the 10-day injured list with a groin injury, per John Gambadoro of Arizona Sports 98.7 FM on X. Fellow backstop Adrian Del Castillo will have his contract selected to take Moreno’s place on the roster. The Snakes already had a 40-man vacancy so no further moves will be required.

Moreno came up limping during yesterday’s game while trying to run out a ground ball. He was removed from the contest with what the team described as a strained left groin. It’s still unclear how long he is expected to be out of action but it’s a rough blow for the Diamondbacks regardless. Moreno is slashing .262/.344/.385 this year for a 107 wRC+ with strong defensive grades as well. FanGraphs considers him to have been worth 2.4 wins above replacement in 86 games.

It’s the second IL stint of the year for Moreno, who also missed some time at the end of June due to a sprained left thumb. Prior to that, he had been sharing the catching duties with Tucker Barnhart, with José Herrera called up to pair with Barnhart in Moreno’s absence. Once Moreno was ready to return in early July, the club decided to keep Herrera around, with Barnhart designated for assignment and eventually released.

That left the Diamondbacks with Moreno and Herrera as the only two backstops on the 40-man roster. Now that Moreno is heading to the IL again, they need to reach into their non-roster depth, which gets Del Castillo up to the majors for the first time.

Now 24 years old, Del Castillo was selected with a competitive balance pick in 2021, going 67th overall in that year’s draft. Baseball America ranked him #29 in Arizona’s system coming into this year but he has launched himself up to #16 in their most recent update. He was #36 at FanGraphs earlier in the year.

BA considers him subpar defensively but strong at the plate, which has shown up at times during his minor league career. That’s especially true here in 2024, which is likely why he earned such a notable bump in the BA rankings. In 100 Triple-A games this year, he has 24 home runs, an 11.5% walk rate and a 16.8% strikeout rate. His .319/.403/.608 batting line translates into a 143 wRC+ even in the hitter-friendly environs of the Pacific Coast League.

If he can bring even a small portion of that production up to the big leagues with him, it will go a long way towards compensating for the loss of Moreno. Herrera has hit just .229/.308/.286 this year for a 72 wRC+ with his glovework graded as near league average. Perhaps Del Castillo can outperform him at the plate but even top prospects can struggle when first exposed to the majors. The club will also have to consider that Herrera has a head start on Del Castillo in terms of building relationships with the pitching staff.

The Snakes are currently 61-52 and essentially in a three-way tie for the National League Wild Card spots with Atlanta and San Diego. Atlanta is 60-51 and percentage points ahead of the two other clubs, who are each 61-52. The Mets are just 1.5 games back of that group and five other clubs are just behind New York. With that crowded playoff race, the importance of every game will be magnified going forward. The catching situation will likely evolve in the coming weeks, depending on how much time Moreno needs to miss and how Del Castillo performs in his first taste of the majors. Herrera is in his final option year and will be out of options in 2025.

Diamondbacks Remove Paul Sewald From Closer Role

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The Diamondbacks are pulling Paul Sewald from the closing role, manager Torey Lovullo announced before tonight’s game against the Pirates (X link via Steve Gilbert of MLB.com). Lovullo did not immediately name a replacement, suggesting the team could go with a committee approach.

Tonight’s game provided an immediate test. Arizona coughed up an early 5-0 lead but bounced back to take a two-run lead into the ninth. Lovullo tabbed sidewinder Ryan Thompson to close it out. Thompson gave up a couple singles and a run but successfully locked down a 9-8 victory. That usage could indicate the sinkerballer will get the bulk of the closing chances, though Arizona needed to use high-leverage arms Kevin Ginkel, A.J. Puk, Dylan Floro and Justin Martinez just to get it to the ninth.

In any case, the Snakes won’t give every narrow ninth inning lead to Sewald. The veteran right-hander had been almost spotless between his early May season debut through the end of June. He carried a 0.54 ERA over 16 2/3 frames. Sewald locked down his first 11 save chances in the process.

Things unraveled for him almost immediately once the calendar turned to July. Sewald gave up multiple runs and blew the lead in each of his first three outings of the month, all of which ended up being Arizona losses. He rebounded with five straight scoreless appearances, but he’s given up runs in three of his four most recent games.

Sewald blew a save in what turned out to be an extra-inning loss to Pittsburgh on Saturday. He got the call on Wednesday to hold a 5-2 lead against the Nationals but put four of five runners aboard (three via walk). Thompson came on and ended up securing a 5-4 win. That’s technically a hold for Sewald but obviously not a good performance.

The nightmarish few weeks came largely out of nowhere. Sewald has been one of the best relievers in MLB since his breakout with the Mariners in 2021. He turned in a 2.88 ERA over parts of three seasons in Seattle. Arizona’s call to send Josh Rojas, Dominic Canzone and Ryan Bliss to the M’s at last year’s deadline added needed stability to the back end of the bullpen.

It ended up being one of the biggest moves in the D-Backs’ surprising pennant run, as Sewald picked up 13 saves with a 3.57 ERA down the stretch. He wasn’t missing quite as many bats as he had in Seattle, but Sewald had a 2.10 ERA with a 25.2% strikeout rate over 34 1/3 innings as a Diamondback until last month. He is an impending free agent, so his performance down the stretch is especially important for him personally.

Arizona made a big deadline move for bullpen help for the second straight year, bringing in Puk for a pair of prospects last month. They swung a more minor deal for Floro minutes before the deadline on Tuesday evening. That gives them some cover to allow Sewald to work through this funk in lower-leverage spots.

The D-Backs are trying to hang onto a Wild Card spot in what remains a crowded National League field. They’re riding a four-game win streak to get a season-high eight games over .500 but are only one game clear of the Mets, the top non-playoff team at the moment.

Two big factors in their potential pennant push: Eduardo Rodriguez and Merrill Kelly. Arizona has been without two of their top starters for the bulk of the season. Rodriguez has yet to make his team debut after sustaining a lat strain in Spring Training. Kelly went down in mid-April with a shoulder strain.

The D-Backs could get a boost from both pitchers. Rodriguez should be reinstated from the 60-day injured list to start next Tuesday’s game against the Guardians, tweets John Gambadoro. Meanwhile, Gilbert relays on X that Kelly is slated to start a rehab stint that same night with High-A Hillsboro. That’d likely kick off a few week rehab process before he’s ready to get back on the mound at Chase Field.

Arizona did get a couple less encouraging updates on the pitching staff, though. Nick Piecoro of the Arizona Republic tweets that reliever Bryce Jarvis is likely to miss the rest of the season with an elbow sprain. The former first-round pick is not expected to require surgery but will need to be shut down from throwing. Jarvis has worked in a low-leverage relief role, tossing 59 1/3 frames of 3.19 ERA ball. His strikeout and walk profile is a lot less impressive than that ERA, but the Duke product has been a bullpen workhorse.

Rookie right-hander Cristian Mena is also likely done for the season. Alex Weiner of AZ Sports reported on Tuesday that the 21-year-old suffered a forearm strain in Triple-A (X link). Mena, who made his MLB debut last month with a three-inning spot start, is on the minor league injured list but could move to the 60-day IL if the Snakes need a 40-man roster spot. The Diamondbacks acquired him over the winter in a one-for-one swap sending outfielder Dominic Fletcher to the White Sox.

Diamondbacks Reinstate Zac Gallen From 15-Day Injured List

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As expected, the Diamondbacks reinstated Zac Gallen from the 15-day injured list today, as Gallen prepares to start Arizona’s game against the Athletics.  Left-hander Brandon Hughes was optioned to Triple-A yesterday to open up a roster spot for Gallen’s return.

Gallen suffered a right hamstring strain just six pitches into a start on May 30, so he’ll now return to action after almost exactly a month off.  The rehab process went pretty smoothly for the ace right-hander, as he didn’t even make any minor league rehab starts during his recovery.  Gallen instead tossed live batting practice sessions, simulated games, and bullpens to ramp up and get ready, and a 67-pitch sim game last Monday was essentially the final step of the process.  Once Gallen came out of a Thursday bullpen session feeling good, the D’Backs finalized their plans to start Gallen today against Oakland.

Needless to say, getting Gallen back after just a month is a sigh of relief for the Diamondbacks, considering how injuries have plagued Arizona’s rotation.  Eduardo Rodriguez signed a four-year, $80MM free agent deal over the offseason but has yet to pitch after suffering a lat strain during Spring Training, and Merrill Kelly will be out until at least mid-August due to a teres major strain in his throwing shoulder.  Jordan Montgomery’s late signing and subsequent late start to the season has also led to some inconsistent results for the left-hander, and between some other struggles for the younger starters, Arizona ranks only 27th of 30 teams in rotation ERA this season.

Gallen was again a bright light for the rotation, with a 3.12 ERA in his first 11 starts and 57 2/3 innings before his hamstring strain.  Missing a month could hurt Gallen’s chances of his third straight top-five finish in NL Cy Young Award voting, yet helping get the Diamondbacks into contention again is surely the chief priority in Gallen’s mind.  Despite the starting pitching concerns and a 39-43 record, the D’Backs are 3.5 games back of the last NL wild card spot, so getting even average results from the rotation could put Arizona more firmly in position for a second-half surge.

In other news about Rodriguez, manager Torey Lovullo told MLB.com and other media that the left-hander will undergo an MRI in a week to ensure that everything is progressing as expected with his lat muscle.  Rodriguez has been throwing at distances of 105 feet, but if the MRI is clean, he’ll start a more intensive throwing program.

NL West Notes: Rodriguez, Thomas, Musgrove, Montgomery

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The Diamondbacks sent both left-hander Eduardo Rodriguez and outfielder Alek Thomas for MRI exams last week, and Torey Lovullo told reporters (per MLB.com’s Injury Tracker) that the results of Rodriguez’s MRI were “very positive,” but that there was no update on Thomas’s status as the club plans to seek second and third opinions on the youngster’s results.

It’s excellent news for the Diamondbacks that Rodriguez is making his way toward a return, with Lovullo indicating that he’s set to begin a throwing program. Rodriguez will be sidelined through at least May 24 due to his placement on the 60-day injured list but it’s at least feasible he could return to game action not long after that if he manages to avoid further setbacks. Rodriguez’s lat injury woes have prevented him from making his Dbacks debut to this point in the 2024 campaign, but he’s coming off an excellent season with the Tigers last year that saw him post a 3.30 ERA and 3.66 FIP in 152 2/3 innings of work and should provide a major boost to an Arizona rotation that’s currently relying on Ryne Nelson and Slade Cecconi in the absence of Rodriguez and veteran righty Merrill Kelly.

As for Thomas, the lack of update from the Diamondbacks is a somewhat ominous sign regarding his hamstring. The 24-year-old was initially scheduled to be activated from the IL last week but ended up exiting a rehab outing with Triple-A due to an issue with his injured hamstring on May 5 that ultimately did not improve after a day off, prompting Arizona to delay his return and send him for testing. Once a consensus top-30 prospect in the sport, Thomas has struggled at the big league level with a .230/.273/.362 slash line in 242 career games but nonetheless figured to be the club’s starting center fielder this season. Corbin Carroll has handled center field in Thomas’s absence with Jake McCarthy stepping from the bench into Thomas’s spot in the lineup while manning right field.

More from the NL West…

  • Padres right-hander Joe Musgrove is making good progress in his return from right elbow inflammation, according to manager Mike Shildt (per MLB.com’s Injury Tracker). The 31-year-old’s initial worrisome diagnosis was described as “precautionary” when he was initially placed on the shelf last week, and it appears that description was an apt one as Musgrove has reportedly already begun light baseball activities, including playing catch. MLB.com writes that the right-hander is optimistic that he’ll be able to return “shortly after” the minimum 15-day stint on the IL, which would likely result in him returning to action sometime next week. San Diego is surely hoping that Musgrove will look more like the ace hurler who posted a 3.05 ERA in 459 2/3 innings in a Padres uniform entering the 2024 campaign than he has to this point in the season, as he struggled badly with a 6.37 ERA and 5.96 FIP in eight starts prior to his placement on the shelf.
  • The Rockies may have lost outfield prospect Benny Montgomery for the season on Friday, as MLB.com’s Thomas Harding relays that the 21-year-old underwent shoulder surgery that Rockies director of player development Chris Forbes said will keep him out until at least “toward the end of the year” if he’s able to return this season at all. The club’s first-round pick in the 2021 draft, Montgomery turned heads during the Arizona Fall League last year with a .333/.436/.500 slash line in 19 games and was hitting a solid .283/.313/.500 in his first taste of Double-A action before being sidelined by the shoulder injury.
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