Miami Marlins

Andrew Nardi

RP

Arm specialist Dr. Keith Meister will perform Nardi's surgery, but the Marlins aren't expected to provide specifics on the procedure until the operation is completed. If Nardi requires a UCL repair or reconstruction rather than something less significant such as a flexor tendon surgery, he'll likely wind up missing the entire 2027 season. Nardi posted a 5.16 ERA, 1.41 WHIP and 27:11 K:BB while collecting three wins and eight holds over 22.2 innings with Miami this season before hitting the shelf May 30.

Adam Mazur

SP

Mazur underwent UCL reconstruction surgery with an internal brace in March. He had been tentatively expected to begin a throwing program in September, though it's unclear whether he's checked that box yet. Mazur might not be an option for the Marlins until around midseason, as he'll likely require time in the minors to knock the rust off.

Robby Snelling

SP

Snelling required an internal brace surgery in May to repair a UCL tear in his left elbow. The recovery time for that type of procedure is shorter than that of a Tommy John rehab, giving Snelling a chance to contribute to the Marlins at some point before the All-Star break. The left-hander yielded three runs in five innings in his major-league debut in 2026, and he's been dominant at Triple-A Jacksonville the last two seasons, authoring a 1.46 ERA and 132:33 K:BB over 98.2 frames.

Ronny Henriquez

RP

Henriquez has already been ruled out for the entirety of the 2026 campaign after undergoing UCL reconstruction surgery in the offseason, but the fact that he's now playing catch is a very encouraging sign of progress. Assuming his rehab continues smoothly, he should be ready for the start of spring training in 2027.

William Kempner

RP

The transaction clears space on the 40-man roster for the addition of Logan Driscoll. Kempner recently underwent UCL surgery on his right elbow and will be sidelined, at minimum, until late in the 2027 season.