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Humberto Castellanos

Eight Players Elect Free Agency

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As the offseason nears, a number of players elect minor league free agency each week. These players are separate from six-year MLB free agents, who’ll reach the open market five days after the conclusion of the World Series. Eligible minor leaguers can begin electing free agency as soon as the regular season wraps up. These players were all outrighted off a team’s 40-man roster during the year and have the requisite service time and/or multiple career outrights necessary to reach free agency since they weren’t added back to teams’ rosters.

Electing free agency is the anticipated outcome for these players. There’ll surely be more to test the market in the coming weeks. We’ll offer periodic updates at MLBTR. These transactions are all reflected on the MiLB.com or MLB.com logs.

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Diamondbacks Outright Humberto Castellanos

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The Diamondbacks have assigned right-hander Humberto Castellanos outright to Triple-A Reno, according to the transactions log on his MLB.com profile page. Castellanos was designated for assignment by the club last week to clear roster space for the return of right-hander Merrill Kelly.

Castellanos, 26, made his big league debut with the Astros back in 2020 but struggled in 10 2/3 innings of work during the shortened season with a 6.75 ERA and 5.35 FIP. Despite those struggles, the Dbacks were interested enough in the righty to claim him off waivers from Houston the following winter, and while the 23-year-old didn’t make the club’s Opening Day roster in 2021 he found his way to Arizona later that season in a swing role. He’d remain in that flexible role with the club over the next two years, shuttling not only between the major and minor leagues but also between the bullpen and the rotation.

Overall, Castellanos’s results left much to be desired in 2021 and ’22 as he pitched to a combined 5.30 ERA and 4.91 FIP in 90 innings of work. It’s worth noting, however, that the right-hander’s numbers were much better out of the bullpen as he posted a 3.68 ERA while striking out 22.2% of batters faced. That may have portended the ability to act as a solid pure reliever, although any hope of finding out more about that possibility was temporarily scuttled by Castellanos undergoing Tommy John surgery late in the 2022 season. Castellanos was outrighted off the club’s 40-man roster while rehabbing but returned to the club on a minor league deal.

The right-hander returned to action as a starter at the minor league level earlier this year but was brought up to the majors to act as a multi-inning reliever when he eventually got the call back to the bigs in June. That first taste of big league action in nearly two years did not go well, as he was lit up for five runs in 2 1/3 innings of work before promptly being sent back down to the minors. He returned to the big leagues last month and looked a lot better as he scattered just six hits and two walks across eight innings of work split between six relief appearances (good for a 1.13 ERA and 2.80 FIP), but that small-sample success wasn’t enough to convince Arizona to keep him on their 40-man roster, perhaps due in part to his lackluster 18.2% strikeout rate even in that otherwise-impressive stretch.

Now back in the minors with Arizona, Castellanos figures to act as a non-roster depth option for the club down the stretch. The right-hander’s pitch counts have stayed fairly low during his most recent stint in the minor leagues and he’s seemingly benefited from that change, with a 2.08 ERA in 13 innings of work across three starts. If Castellanos continues to find success in shorter bursts at the minor league level, it’s feasible to imagine him getting another look in the majors as a reliever at some point in the future, whether that be with Arizona later this year or after he returns to free agency this winter.

Diamondbacks Reinstate Merrill Kelly From 60-Day IL, DFA Humberto Castellanos

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The Diamondbacks have reinstated veteran starter Merrill Kelly from the 60-day injured list, the team announced. To make room for the right-hander on the active roster, righty reliever Scott McGough has been optioned to Triple-A Reno. Meanwhile, fellow righty Humberto Castellanos has been designated for assignment to free up a spot on the 40-man.

Kelly, now 35, was a durable and dependable starter for the Diamondbacks from 2021-23, making 90 starts and pitching to a 3.66 ERA and 4.16 SIERA. He got off to a strong start over his first four outings in 2024, putting up a 2.19 ERA and 3.88 SIERA in 24 2/3 innings pitched, but he suffered a teres major strain in mid-April. The right-hander will make his highly anticipated return this afternoon against the Phillies, and the D-backs will have their full rotation healthy for the first time this season. Manager Torey Lovullo now has six healthy starters at his disposal: Zac Gallen, Brandon Pfaadt, Eduardo Rodriguez, Jordan Montgomery, Ryne Nelson, and Kelly.

McGough, 34, signed a two-year deal with Arizona during the 2022-23 offseason. He was a serviceable middle reliever last season, pitching to a 4.73 ERA and 3.49 SIERA over 70 1/3 innings, but he has struggled in 2024. Over 29 innings, McGough has a 6.83 ERA and 5.63 SIERA. This is the third time he has been optioned this season.

As for Castellanos, 26, he has failed to make much of an impression over 32 games (16 starts) for the Diamondbacks at the big league level. Since the D-backs claimed him off of waivers from the Astros during the 2020-21 offseason, he has pitched to a 5.29 ERA and 4.89 SIERA over 100 1/3 innings as both a starter and a reliever. His minor league stats aren’t much better; he has a 4.59 ERA and 6.64 FIP at Triple-A this year. If Castellanos passes through waivers unclaimed, he will have the right to reject an outright assignment to Triple-A and elect free agency.

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 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 Sign Ricky Karcher To Minor League Deal

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The D-Backs have signed reliever Ricky Karcher to a minor league contract, according to Matt Eddy of Baseball America. The Snakes also brought back Humberto Castellanos on a non-roster deal.

Karcher joins the second organization of his career. The Reds selected him in the 13th round of the 2017 draft. The 6’4″ righty moved to the bullpen full-time in 2021. He has shown the ability to miss plenty of bats in the minor leagues but also demonstrated significant control issues. In parts of six minor league seasons, he owns a 26.4% strikeout rate while walking a massive 20.4% of batters faced.

Despite the strike-throwing concerns, Cincinnati added Karcher to the 40-man roster last offseason. That kept him out of the Rule 5 draft. They called him up for the first time in early June. He pitched once, tossing a scoreless inning against the Royals. Karcher averaged just under 98 MPH with his fastball in that appearance, pointing to the power arsenal he has shown in the minors.

That wasn’t enough to hold his roster spot with the Reds. The 26-year-old had a rough season at Triple-A Louisville, where he walked almost a quarter of his opponents over 60 1/3 innings. He posted a 4.77 ERA in 51 outings there, with Cincinnati outrighting him from the 40-man around the All-Star Break. Karcher qualified for minor league free agency at season’s end.

Castellanos is a depth starter who logged 100 2/3 MLB innings with the Astros and D-Backs between 2020-22. A soft-tossing control specialist, he owns a 5.45 ERA with a modest 16.6% strikeout rate. The right-hander underwent Tommy John surgery in August 2022. Arizona ran him through waivers last offseason and he missed this year rehabbing. If he’s healthy next spring, he could head to Triple-A Reno as rotation or long relief insurance.

Diamondbacks Outright Humberto Castellanos, Tyler Zuber, Buddy Kennedy

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November 11: The Diamondbacks announced that they have outrighted Castellanos and Zuber, as well as infielder Buddy Kennedy.

November 10: The Diamondbacks announced a batch of roster moves today, reinstating five players from the 60-day injured list. They are infielders Nick Ahmed and Emmanuel Rivera, left-hander Tyler Gilbert, along with right-handers Humberto Castellanos and Tyler Zuber. Those latter two names have also been designated for assignment. That leaves the club’s 40-man roster at exactly 40.

Starting today and until Spring Training, there is no injured list. That means that most teams around the league are facing roster crunches as players on the 60-day IL have to retake their roster spots. The D-Backs reinstated these five but also had to designate a couple of them in order to get their roster down to an even 40.

Zuber, 28 in June, was just claimed off waivers from the Royals a couple of weeks ago. The fact that Arizona has quickly put him back into DFA limbo perhaps suggests that their plan in claiming him has been to pass him through waivers and hang onto his rights. He missed all of 2022 due to a shoulder impingement but recently began throwing again. When he was last healthy in 2021, he had poor results in the majors but put up a 2.83 ERA in Triple-A with a 37.1% strikeout rate, though an unfortunate 13.8% walk rate. If he clears waivers, the D-Backs can try to help him with his control but without Zuber taking up a roster spot.

As for Castellanos, 25 in April, he made 11 appearances for the Snakes in 2022, including nine starts. Unfortunately, he required Tommy John surgery in August and is likely to miss the entire 2023 season.

Humberto Castellanos To Undergo Tommy John Surgery

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Diamondbacks right-hander Humberto Castellanos will undergo Tommy John surgery, manager Torey Lovullo announced (via Steve Gilbert of MLB.com). The 24-year-old is already on the 60-day injured list, having missed the past couple months with an elbow strain.

Castellanos’ efforts to avoid going under the knife will prove unsuccessful, and he’ll likely miss all of next season recovering. It’s a hit to the club’s rotation depth, as the Mexican-born hurler has started 16 of his 25 outings for Arizona over the past two years. Castellanos, who also made eight relief appearances with the Astros during the shortened 2020 season, was a January 2021 waiver claim.

The 5’11” hurler has tossed 100 2/3 innings at the major league level, working to a 5.45 ERA. He doesn’t throw hard, with his fastball typically clocking in the 89-90 MPH range. That has translated to a lack of missed bats, with Castellanos generating swinging strikes at a meager 7.2% clip. He’s a plus strike-thrower, though, walking only 7.3% of batters faced in the big leagues.

Castellanos will be paid at the MLB minimum rate and collect big league service time for the remainder of the season. He’ll have to be reinstated from the injured list at the start of the offseason. He won’t be arbitration-eligible until the end of next year, so the D-Backs could affordably keep him around if they’re willing to devote him a 40-man roster spot over the winter.

Diamondbacks Claim Humberto Castellanos

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The Diamondbacks have claimed right-hander Humberto Castellanos off waivers from the Astros, Chandler Rome of the Houston Chronicle was among those to report. The Astros designated Castellanos for assignment last Friday.

Castellanos, 22, made his major league debut last season with 10 2/3 innings of eight-run ball, striking out 12 batters and issuing five walks in the process. While his production in Houston wasn’t particularly impressive, Castellanos has done a nice job at the lower levels, including during his first taste of Triple-A action in 2019. Castellanos owns a 2.92 ERA with 205 strikeouts against 46 walks in 216 minor league innings.

Astros Designate Humberto Castellanos

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The Astros have designated right-hander Humberto Castellanos for assignment, Chandler Rome of the Houston Chronicle tweets. The move cleared space for just-signed catcher Jason Castro.

Castellanos joined the Astros as a July 2 signing from Mexico in 2015. He debuted in rookie ball the next year and eventually climbed up the minor league ladder to the majors. Castellanos has pitched to an impressive 2.92 ERA in 216 minor league innings, also adding 205 strikeouts against just 46 walks.

Unfortunately for Castellanos, the 22-year-old’s initial taste of MLB action last season didn’t go well. He yielded eight earned runs on 12 hits (including two homers) and five walks in 10 2/3 innings, though he did post 12 strikeouts.

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