Miami Marlins· #71· Pitcher
William Kempner
Bats R · Throws R·Age 25 (Jun 18, 2001)·6' 0", 222 lb·San Jose, CA, USA
2026 Pitching
ERA
2.92
WHIP
0.97
IP
12.1
K%
28.0
BB%
8.0
K/9
10.22
W-L
1-0
GS
0
SV
0
HLD
0
DiamondIQ WAR
12.3 IP · 2026
0.2
2.1 runs above replacement
FIP · 3.34 (park 0.99)0.0
vs replacement · RP, 12.3 IP+2.1
FIP-based runs above replacement, park-adjusted, scaled by innings over runs-per-win. Reliever leverage is simplified (v1). Full methodology.
Pitch Arsenal · Statcast
Four-Seam48% · 95.5 · 39% whiff
Sweeper22% · 81.6 · 32% whiff
Sinker15% · 94.0 · 18% whiff
Cutter13% · 87.3 · 44% whiff
Changeup3% · 86.8 · 0% whiff
Career Pitching
| Yr | Tm | W | L | ERA | G | GS | SV | IP | SO | BB | WHIP | K/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | Miami Marlins | 1 | 0 | 2.92 | 9 | 0 | 0 | 12.1 | 14 | 4 | 0.97 | 10.22 |
Recent Games
Jul 11 vs Cleveland GuardiansL
2.0 IP, 2 ER, 3 K, 0 BB
Jul 9 vs Seattle MarinersW
0.1 IP, 2 ER, 0 K, 2 BB
Jul 3 @ AthleticsW
1.0 IP, 0 ER, 1 K, 0 BB
Jun 15 @ Philadelphia PhilliesL
2.1 IP, 0 ER, 2 K, 0 BB
Jun 10 vs Arizona DiamondbacksW
2.0 IP, 0 ER, 3 K, 2 BB
Jun 5 vs Tampa Bay RaysL
1.1 IP, 0 ER, 1 K, 0 BB
May 31 @ New York MetsL
1.1 IP, 0 ER, 3 K, 0 BB
May 30 @ New York MetsL
1.0 IP, 0 ER, 0 K, 0 BB
May 5 vs Baltimore OriolesL
1.0 IP, 0 ER, 1 K, 0 BB