William Kempner
Miami Marlins
USA- Birth country
- USA
- Age
- 25
- Height
- 6' 0"
- Bats
- Right-handed
- Throws
- Right-handed
- MLB debut
- 2026-05-05
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9 Games| Date | Opponent | Result | Innings | Strikeouts | Earned runs |
|---|---|---|---|---|---|
 Cleveland Guardians | L | 2.0 | 3 | 2 | |
 Seattle Mariners | W | 0.1 | 0 | 2 | |
 Athletics | W | 1.0 | 1 | 0 | |
 Philadelphia Phillies | L | 2.1 | 2 | 0 | |
 Arizona Diamondbacks | W | 2.0 | 3 | 0 | |
 Tampa Bay Rays | L | 1.1 | 1 | 0 | |
 New York Mets | L | 1.1 | 3 | 0 | |
| New York Mets | L | 1.0 | 0 | 0 | |
 Baltimore Orioles | L | 1.0 | 1 | 0 |