William Kempner
Miami MarlinsP
Age: 25
Bats/Throws: R/R
6'0" / 222
DOB: 6/18/2001
(25 years, 4 months, 4 days)
P
| Season | 2026 | 2026 | Total |
| Team | FGDC | MIA | - - - |
| Level | PROJ | MLB | MLB |
| G | 24 | 9 | 9 |
| GS | 0 | 0 | 0 |
| IP | 24.0 | 12.1 | 12.1 |
| K% | 21.0% | 28.0% | 28.0% |
| BB% | 12.0% | 8.0% | 8.0% |
| GB% | 30.0% | 30.0% | |
| ERA | 4.77 | 2.92 | 2.92 |
| FIP | 4.88 | 3.34 | 3.34 |
| WAR | 0.0 | 0.1 | 0.1 |
2026 Pitch
Selection
Selection
FA:48%
SL:22%
SI:15%
FC:13%
RosterResource
| Current Role: | Injured List: (RR) |
| How Acquired: | Trade (SFG) Jan'24 |
| Draft: | 2022, Rd: 3, Pick: 26, Ovr: 106 |
| Draft Team: | San Francisco Giants |
| Signing Bonus: | $525,000 |
| College: | Gonzaga |
Service Time
0.000MiLB Options
2
News
Rotowire: The Marlins transferred Kempner (elbow) to the 60-day injured list Friday. (8/21/2026)
Injury: Elbow, 60-Day IL
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