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Out · expected back around Sep 1
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.
2026 season
- GP
- 9
- W-L
- 1-0
- ERA
- 2.92
- WHIP
- 0.97
- K
- 14
- IP
- 12.1
Game log
| Date | Opp | Result | Dec | IP | H | ER | BB | K |
|---|---|---|---|---|---|---|---|---|
| Jul 11 | vs CLE | L 1-4 | - | 2.0 | 3 | 2 | 0 | 3 |
| Jul 9 | vs SEA | W 8-4 | - | 0.1 | 2 | 2 | 2 | 0 |
| Jul 3 | @ATH | W 12-5 | - | 1.0 | 0 | 0 | 0 | 1 |
| Jun 15 | @PHI | L 0-7 | - | 2.1 | 0 | 0 | 0 | 2 |
| Jun 10 | vs AZ | W 8-0 | W | 2.0 | 0 | 0 | 2 | 3 |
| Jun 5 | vs TB | L 0-6 | - | 1.1 | 1 | 0 | 0 | 1 |
| May 31 | @NYM | L 1-10 | - | 1.1 | 2 | 0 | 0 | 3 |
| May 30 | @NYM | L 1-6 | - | 1.0 | 0 | 0 | 0 | 0 |
| May 5 | vs BAL | L 7-9 | - | 1.0 | 0 | 0 | 0 | 1 |
Latest news
The Marlins transferred Kempner (elbow) to the 60-day injured list Friday.
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.
RotoWire via ESPN · Aug 21
Marlins manager Clayton McCullough said Wednesday that Kempner will require surgery for his sprained right elbow, Jordan McPherson of the Miami Herald reports.
The Marlins aren't expected to provide further details until the operation is performed, but Kempner will presumably require Tommy John or internal brace surgery (or a hybrid of the two), which will keep him out for the rest of the 2026 season and most, if not all, of the 2027 campaign. The 25-year-old righty was placed on the injured list July 12 and had initially taken the rest-and-rehab approach for his treatment plan, but he apparently wasn't progressing as well as the Marlins had hoped. He'll close the season with a 2.92 ERA, 0.97 WHIP and 14:4 K:BB in 12.1 innings over nine appearances with the big club.
RotoWire via ESPN · Aug 12
The Marlins placed Kempner on the 15-day injured list Sunday due to a right elbow sprain.
Kempner was called upon to pitch Thursday against Seattle and Saturday versus Cleveland and struggled in both games, allowing four runs on five hits with three strikeouts and two walks over 2.1 innings. He'll now be sidelined until at least July 27.
RotoWire via ESPN · Jul 12
The Marlins recalled Kempner from Triple-A Jacksonville on Friday, Christina De Nicola of MLB.com reports.
Kempner was sent down last month despite logging nine scoreless innings with a 10:2 K:BB in six relief appearances. The 25-year-old will likely fill a middle relief role, but his stay in the majors could be brief as the Marlins will need a spot next week for a fifth starter, expected to be Janson Junk (shin).
RotoWire via ESPN · Jul 3
Kempner was optioned to Triple-A Jacksonville on Tuesday.
The right-hander fired 2.1 scoreless innings Monday against the Phillies and is being sent down Tuesday in favor of a fresh bullpen arm (Dax Fulton). Kempner has given up just three hits with a 10:2 K:BB across nine scoreless frames in the majors this season, so it should only be a matter of time before he gets another look with the big club.
RotoWire via ESPN · Jun 16
Kempner (1-0) picked up the win Wednesday, walking two and striking out three over two scoreless, no-hit innings of relief in a victory over the Diamondbacks.
The rookie right-hander took the mound in the seventh inning, the third of four Miami pitchers in a combined shutout, and he wound up being credited with the win. Kempner has yet to allow a run in his first five big-league appearances, posting a 0.75 WHIP and 8:2 K:BB over 6.2 innings, but he doesn't yet appear to be part of the high-leverage picture for manager Clayton McCullough -- he entered Wednesday's contest with the Marlins already up 8-0.
RotoWire via ESPN · Jun 11