Miami Marlins
#71
William Kempner
William Kempner is a right-handed pitcher for the Miami Marlins. In 2026, Kempner has posted a 2.92 ERA with 14 strikeouts in 12.1 innings pitched. William made his MLB debut on May 5, 2026 and was born in San Jose, USA.
William Kempner — 2026 Pitching Stats
2.92
ERA
1--
W-L
14
SO
0.97
WHIP
12.1
IP
-
FIP
-
xFIP
-
SIERA
10.22
K/9
2.92
BB/9
-
WAR
9
G
-
GS
-
SV
8
H
1
HR
4
BB
William Kempner — 2026 Statcast Data
91.0
Avg Velocity
98.4
Max Velocity
2489
Avg Spin (RPM)
199
Total Pitches
William Kempner — 2026 Pitch Arsenal
William Kempner — Career Pitching Stats
| Year | Team | W | L | ERA | G | GS | SV | IP | SO | BB | WHIP | FIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | MIA | 1 | - | 2.92 | 9 | - | - | 12.1 | 14 | 4 | 0.97 | - | - |
William Kempner — Batting Stats
| Year | Team | G | PA | AVG | HR | RBI | OBP | SLG | OPS |
|---|---|---|---|---|---|---|---|---|---|
| 2026 | MIA | 9 | - | - | - | - | - | - | - |
