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MLB player profile

William Kempner

Current club

Miami Marlins

Season spotlight

ERA
2.922026

Uniform

71

Bats

Right

Throws

Right

Player profile

Age

25

Born

San Jose, CA, USA

Height

6' 0"

MLB debut

May 5, 2026

Birth date

June 18, 2001

Weight

222

Verified source

MLB Stats API

·

November 12, 2026 · 2:00 am EST Open official record ↗

Current season line

2026

G

9

PA

0

H

0

HR

0

RBI

0

AVG

.000

OBP

.000

SLG

.000

OPS

.000

SB

0

G

9

GS

0

IP

12.1

W

1

L

0

ERA

2.92

WHIP

0.97

SO

14

SV

0

HLD

0

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