Marlins’ Prospect Thomas White Suffers Capsular Sprain

Marlins top pitching prospect Thomas White has been diagnosed with a capsular sprain in his throwing shoulder, the team announced (relayed by Isaac Azout of Fish On First). It’s a 3-4 month recovery timeline that’ll threaten the remainder of the 2026 season.

Azout also notes that infielder Maximo Acosta underwent surgery last month to address a UCL sprain in his right thumb. Acosta has been on the minor league injured list and last played on May 10. That came with an 8-10 week timeline from the date of the surgery.

White’s loss in the much more significant of the two. The left-hander is Miami’s top prospect, according to Baseball America. He placed even more prominently coming into the season; BA had him behind only Nolan McLean among MLB pitching prospects during their offseason Top 100 ranking. They had him 15th overall and fourth among pitchers in their updated Top 100 earlier in the week.

The 21-year-old lefty is coming off a season in which he turned in a 2.31 ERA with a monster 39% strikeout rate over 21 starts from High-A to Triple-A. Injuries have limited him to seven appearances and 24 2/3 frames this year. There’s no indication surgery will be necessary, but a major shoulder injury clouds his outlook going into the 2027 campaign. It almost certainly delays his big league debut, as White stood a good chance of getting to loanDepot Park this year had he stayed healthy.

Miami has had some rough luck on the injury front with their young pitchers. Robby Snelling, their second-best pitching prospect, made his MLB debut in early May. His elbow gave out during a between starts throwing session and he underwent UCL surgery that’ll sideline him well into next season. They’re also without Eury Pérez for the next couple months with a gracilis strain.

Max Meyer has stayed healthy so far and is pitching at a top-of-the-rotation level. The rest of the rotation has been underwhelming, leaving Miami with a 4.75 ERA from their starters. It’s the third-worst mark in the National League from what was expected to be the team’s strength.

White is not on the 40-man roster and would not be eligible for the Rule 5 draft until the 2027-28 offseason. There’s no incentive for Miami to put him on the roster this year. Acosta does occupy a 40-man spot and could go on the 60-day injured list if the Marlins need space for a corresponding move. That would require paying him the prorated $780K MLB minimum as opposed to the minor league salary he’s making while on the Triple-A injured list.

Acquired from the Rangers in the 2024 Jake Burger deal, Acosta debuted last season and hit .204 in 19 games. He was batting .200 with one home run across 17 Triple-A contests this year. Most evaluators feel he projects as a glove-first depth infielder.