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Diamondbacks Select Garrett Hampson

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TODAY: The Diamondbacks announced that they have selected Hampson’s contract, keeping him in the organization and essentially assuring him of a spot on their Opening Day roster. Walston was transferred to the 60-day injured list in order to make room for Hampson on the 40-man roster.

March 21: Infielder/outfielder Garrett Hampson plans to exercise the upcoming opt-out in his minor league deal with the Diamondbacks, reports Jon Heyman of The New York Post. The opt-out date is tomorrow and the Diamondbacks will then have 48 hours to decide whether to add Hampson to the roster or let him return to free agency.

Hampson is an Article XX(b) free agent, which is any player with at least six years of service who finished the previous season on a major league roster or injured list. Such players have guaranteed opt-out dates on minor league deals signed at least ten days prior to Opening Day. The first of those opt-out dates is five days prior to Opening Day, which will be tomorrow. The others are May 1 and June 1. When a player triggers an opt-out, the club has 48 hours to decide how to respond.

A veteran of seven big league seasons, Hampson has previously suited up for the Rockies, Marlins and Royals. He has generally served as a light-hitting utility player who provides some speed and versatility. His career batting line of .240/.301/.362 translates to a wRC+ of 69, indicating he’s been 31% below average overall. But he’s stolen 64 bases in 79 tries while playing every position except catcher.

He signed a minor league pact with the Snakes in January, a deal which will reportedly pay him $1.5MM if he cracks the big league roster. He’s had a decent showing in camp. His career walk rate is just 7.7% but he’s taken free passes at an 11.4% clip this spring. It’s a small sample of 44 plate appearances but his .289/.386/.368 line is solid, translating to a 107 wRC+.

The Diamondbacks likely need a multi-positional guy like Hampson. Of their four bench spots, one will be taken by a backup catcher, likely José Herrera. Another spot will go to outfielder Randal Grichuk. Of the two remaining bench spots, they will want at least one infielder, ideally one who can cover multiple spots.

On the 40-man roster at present, they have Jordan Lawlar, Blaze Alexander, Tim Tawa and Grae Kessinger. Alexander is out with an oblique strain. Lawlar is one of the top prospects in the league and missed a lot of 2024 due to injuries. The Diamondbacks surely want him playing regularly in Triple-A and optioned him earlier this week. Tawa and Kessinger have also been optioned to Triple-A already. The club could always recall them but it seems they have tipped their hand a bit.

The Diamondbacks also have Ildemaro Vargas in camp as a non-roster invitee. Whether it’s Hampson or Vargas getting a roster spot, the Snakes will need to make room. Blake Walston is out with Tommy John surgery and could be moved to the 60-day injured list to open one spot. If the club wants add both Hampson and Vargas, or perhaps an NRI pitcher like Shelby Miller, they would have to find a way to open another.

Photo courtesy Rob Schumacher, Imagn Images

Blake Walston To Undergo Tommy John Surgery

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Diamondbacks left-hander Blake Walston will undergo Tommy John surgery, manager Torey Lovullo tells Alex Weiner of Arizona Sports. The southpaw will therefore miss the entire 2025 season and likely a decent chunk of 2026 as well.

Walston, 24 in June, was the 26th overall pick of the 2019 draft. His results as a minor league have been mixed. By the end of 2022, he had climbed as high as Double-A. Overall, he had 230 2/3 innings under his belt. He had a 4.25 earned run average, 27.7% strikeout rate and 8.3% walk rate.

In 2023, he was promoted to the Triple-A Reno Aces, a club that plays in the hitter-friendly Pacific Coast League. He has since tossed 214 1/3 innings at that level with a 4.62 ERA, 17.9% strikeout rate and 12.9% walk rate. He also made his major league debut in 2024, posting a 4.42 ERA in 18 1/3 innings. He spent a little over two months on the injured list due to left elbow inflammation, perhaps an omen for today’s news.

Walston’s surgery is obviously not great for his development. As a former first-round pick and notable prospect in the system, spending a year on the shelf is a lost opportunity, when he would ideally be continuing to refine his craft.

For the Diamondbacks and their pitching depth, they’re probably not so worried about the short term. Their current rotation mix is loaded. They have seven viable rotation candidates in Corbin Burnes, Zac Gallen, Merrill Kelly, Eduardo Rodríguez, Brandon Pfaadt, Jordan Montgomery and Ryne Nelson. A few injuries throughout the season are inevitable but the Snakes also have Drey Jameson, Cristian Mena, Yilber Díaz, Tommy Henry and Joe Elbis on the 40-man roster.

But Gallen, Montgomery and Kelly are each slated for free agency at the end of this season. Burnes has an opt-out chance after 2026. Rodriguez is only guaranteed through 2027. The club is surely hoping that some of their younger pitchers step up and get themselves in position to take over those jobs down the road. But in Walston’s case, he’ll be on ice for a year-plus. Once he’s healthy, he’ll then have to play catch-up and get himself back into the mix.

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 Designate Dylan Floro For Assignment

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The Diamondbacks announced today that they’ve designated right-hander Dylan Floro for assignment. The move makes room on the active roster for left-hander Blake Walston, who was recalled from Triple-A. Arizona’s 40-man roster stands at 39.

Floro, 33, signed a one-year deal with the Nationals over the offseason but was dealt to the Diamondbacks in a buzzer-beater deal just before this year’s trade deadline in exchange for first baseman Andres Chaparro. At the time of the deal, Floro had gotten excellent results with a 2.06 ERA and a 2.64 FIP in 52 1/3 innings of work despite a lackluster 19.6% strikeout rate. That hasn’t continued in Arizona, as Floro’s time with the Diamondbacks has been nothing short of a disaster. The righty has surrendered a 9.37 ERA in 16 1/3 innings of work, and while his 6.30 FIP over that same timeframe indicates some level of positive regression in the future, even that lower figure would still be ghastly production for the right-hander.

Floro will be either released or placed on waivers in the coming days, though if the right-hander is waived he’ll surely clear waivers with so little time left in the regular season. Should he clear waivers, he’ll have the opportunity to either accept an outright assignment to the minors as non-roster depth for what’s left of the season or else elect free agency and get a head start on searching for a deal for the 2025 season with a new club. Disastrous as his time in Arizona was, the right-hander still boasts a 3.80 ERA and 3.51 FIP overall this season. Those figures should be good enough to earn him some level of interest on the open market, though perhaps only on a minor league deal given his rough second half.

As for Walston, the 23-year-old rookie made his big league debut with the Diamondbacks back in May. He’s made three appearances for Arizona since then, two of which were starts. In all, he has a 2.84 ERA and 4.28 FIP in 12 2/3 innings of work, though that comes with nearly as many walks (9) as strikeouts (11) and three additional hit batsmen. With Ryne Nelson having recently been placed on the injured list, the addition of Walston to the roster should give the club another multi-inning relief option from the left side now that Jordan Montgomery is seemingly slated to re-enter the rotation in Nelson’s place.

Diamondbacks Select Humberto Castellanos

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The D-Backs announced they’ve selected right-hander Humberto Castellanos onto the major league roster. Arizona also recalled lefty reliever Joe Jacques from Triple-A Reno, a move which was reported this afternoon. To clear the necessary spots on the MLB roster, the Snakes optioned southpaw Brandon Hughes and placed lefty Blake Walston on the 15-day injured list with inflammation in his throwing elbow. Arizona also reinstated righty Luis Frías from the 15-day IL and optioned him to Reno.

Arizona had an opening on the 40-man roster, which they’ll use to give Castellanos his first MLB look in two years. The Mexican-born hurler pitched in 25 games, including 16 starts, for the D-Backs between 2021-22. He turned in a 5.30 ERA over 90 innings before undergoing Tommy John surgery in August 2022. That led Arizona to outright him off their roster at the end of the season and forced him to sit out all of last year.

The Diamondbacks brought Castellanos back on a minor league contract over the winter. He’s healthy again and has logged 43 2/3 innings over 10 appearances in Triple-A. Castellanos has a 4.57 earned run average that is quite impressive considering Reno is among the toughest places to pitch in affiliated ball. He has punched out a solid 24.3% of opposing hitters, although he has also issued walks at a career-high 11.4% rate.

For most of his MLB career, Castellanos has shown the opposite profile: plus control without the ability to miss many bats. He has a modest 16.6% strikeout rate with a 7.3% walk percentage in 100 2/3 innings between the Astros and D-Backs. Castellanos doesn’t throw especially hard, but he can work out of the rotation or in long relief for Torey Lovullo. He still has a minor league option, allowing the Diamondbacks to send him back to Reno at any point without putting him on waivers.

Walston, a first-round pick in 2019, has made his first three MLB appearances this season. The North Carolina native has allowed four runs over 12 2/3 innings, striking out 11 against nine walks. It’s not clear how long he’ll be out of action. The Diamondbacks will presumably play things cautiously with any elbow issue for one of their more talented young pitchers.

Diamondbacks Designate Matt Bowman For Assignment

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The Diamondbacks announced this afternoon that right-hander Matt Bowman has been designated for assignment. Left-hander Blake Walston was recalled to the big league roster to replace Bowman on the club’s active roster.

Bowman, who will celebrate his 33rd birthday on Friday, joined the Diamondbacks earlier this month when he was acquired in cash deal with the Twins. At the time of the deal, Bowman had been squeezed off of Minnesota’s 40-man roster despite a solid showing in five appearances, where he posted a 2.35 ERA in 7 2/3 innings of work. Unfortunately, the wheels have come off for Bowman across his four appearances with Arizona, as he’s been shelled for six runs on eight hits and two walks in 6 2/3 innings of work that have ballooned his ERA to 5.02 on the year.

A 13th-round pick by the Mets in the 2012 draft, Bowman had considerable success with the Cardinals in the first two seasons of his big league career from 2016 to ’17. In a combined 126 1/3 innings of work, Bowman posted a solid 3.70 ERA (112 ERA+) with a stronger 3.47 FIP. That seemingly portended a successful career near the back of big league bullpens, but things didn’t work out that way as Bowman struggled to well below average results with St. Louis the following season, prompting the club to part ways with him.

He pitched for the Reds in 2019 to an impressive 129 ERA+ in 32 innings of work but a series of elbow injuries, including one that required Tommy John surgery, wiped out Bowman’s 2020-22 campaigns. The veteran resurfaced with the Yankees last year but was torched for a 9.00 ERA and 6.51 FIP in four innings of work before returning to the minor leagues. Arizona will now have one week to trade Bowman or attempt to pass him through waivers. The right-hander has been outrighted previously during his big league career and as a result can reject an outright assignment in favor of free agency should he so choose.

Replacing Bowman on the club’s 40-man roster is Walston, who is slated to take the ball for today’s start against the Marlins. It’ll be the first big league start and just the second MLB appearance of Walston’s young career. Arizona’s first-round pick in the 2019 draft, the 23-year-old climbed his way through up the minor league ladder to make his big league debut earlier this year, when he struck out five in 3 2/3 innings of work against the Dodgers while allowing two runs on three hits and four walks. That admirable effort against one of the league’s most intimidating offenses has earned Walston another opportunity in the majors thanks in part to the injuries facing the Dbacks rotation. Marquee offseason signing Eduardo Rodriguez has yet to throw a pitch for the club this year due to a strained lat and he’s been joined on the 60-day injured list by veteran righty Merrill Kelly, who is battling a shoulder strain.

Diamondbacks Promote Blake Walston For MLB Debut

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The Diamondbacks announced that they have optioned left-hander Andrew Saalfrank, with fellow lefty Blake Walston recalled in a corresponding move. The latter will be making his major league debut as soon as he gets into a game.

Walston, 23 next month, was the club’s first round pick in 2019. The Diamondbacks used the 26th overall pick of that year’s draft to grab Walston out of New Hanover High School in Wilmington, North Carolina.

He got a brief debut in the professional ranks in 2019, but then the minors were canceled due to the pandemic in 2020. He tossed 95 2/3 innings in 2021 between Single-A and High-A with a 3.76 earned run average, 28.8% strikeout rate and 8.1% walk rate.

In 2022, he returned to High-A but cruised through four starts before getting bumped up. He had a 5.16 ERA over his 21 Double-A starts that year, despite decent peripherals. He struck out 24% of batters faced and walked 8.5%, but a .341 batting average on balls in play and 14.5% home run per flyball rate added some extra runs.

Last year, he was sent to Triple-A and had a 4.52 ERA over 30 starts. He walked 14% of batters faced while only striking out 15.6% of them. He was added to Arizona’s 40-man roster in November to keep him out of the Rule 5 draft and returned to Triple-A this year. Through 20 2/3 innings this season, he has walked 15.3% of batters faced, striking out 19.4%, leading to a 4.79 ERA. Were it not for a 77.6% strand rate, he may have fared worse, which is why his FIP is at 6.36.

That lack of control perhaps points to a future relief role but he is still quite young and has time to rein in his stuff. The Diamondbacks have continued to stretch him out, suggesting they still believe in his potential to stick in a rotation at some point. Baseball America ranked him the #11 prospect in the club’s system coming into this year.

For now, he’s likely on the roster to give the club a multi-inning option out of the bullpen due to some strange circumstances. Jordan Montgomery was supposed to start yesterday’s game before it was delayed by a colony of bees that had taken up residence in the netting behind home plate. The start of the contest was delayed by about two hours while was called who could remove the bees, and the club decided to scratch Montgomery in that time. It seems fair to assume that Montgomery had already gone through some pregame preparations and the club didn’t want to ramp him back up again after a lengthy shutdown, similar to how pitchers often don’t return after long rain delays.

In the end, the Snakes went with a bullpen game and used seven different pitchers to cover 10 innings, as they eventually defeated the Dodgers in extra innings. Montgomery is taking the ball tonight but with a weakened bullpen, so Walston may be tapped, especially if Montgomery is bounced early.

Diamondbacks Select Blake Walston, Outright Chris Rodriguez

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The D-Backs announced they’ve added left-hander Blake Walston to the 40-man roster. That ensures he won’t be selected in next month’s Rule 5 draft. To clear a spot, the Snakes outrighted righty Chris Rodriguez off the roster.

Arizona drafted Walston 26th overall in 2019. The 6’5″ hurler was an upside flier out of a North Carolina high school. His minor league résumé has been somewhat mixed, although he still draws praise for his projectable frame and athleticism. Baseball America rated him as the #5 prospect in a quality Arizona system midseason.

Walston spent all of 2023 at Triple-A Reno. That’s an exceedingly difficult environment for a young pitcher. He posted a decent 4.52 ERA in 149 1/3 innings covering 30 starts. That came without particularly impressive strikeout or walk numbers, though. He punched out only 15.6% of opponents while walking 14% of batters faced.

Arizona just claimed Rodriguez off waivers from the Angels a couple weeks ago. They’ve succeeded in passing him through unclaimed, meaning he’ll remain in the organization without occupying a 40-man spot. A hard-throwing reliever, Rodriguez has battled shoulder and back injuries for the better part of three years. He has barely pitched since 2021. He’ll hopefully be able to put the injuries beyond him and compete for a bullpen job in Spring Training.

Diamondbacks To Sign First-Rounder Blake Walston

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The Diamondbacks have reached an agreement with first-round left-hander Blake Walston, the team announced. Walston received $2.45MM, just below the $2,653,400 slot value, Jim Callis of MLB.com tweets.

The Walston agreement brings the Diamondbacks closer to finishing their heavy lifting with respect to this year’s draft. They already signed fellow top 60 picks Corbin Carroll, Brennan Malone, Drey Jamison and Ryne Nelson before reaching a deal with Walston. That group helped comprise quite a 2019 haul for the Diamondbacks, who entered this draft with a league-high $16,093,700 to spend on their selections.

Arizona received the pick it used on Walston because it failed to sign 2018 first-rounder Matt McClain a year ago. In Walston, the team’s getting a prospect whom FanGraphs, Baseball America, ESPN’s Keith Law and MLB.com each ranked in or near the top 50 players available entering the draft. Law (subscription required) noted the high school hurler from North Carolina could be difficult to sign, but the Diamondbacks now have the 17-year-old under wraps.

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