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William Kempner

Marlins Career team 2026
Number #71
Position RP
Bats R
Throws R
Age 25
Height 6' 0"
Weight 222 lbs
Birth Place San Jose, CA
Born Jun 18, 2001

Key Insights

2026
There is one pitch of his that keeps getting hit

Contact off Kempner's 4-seam fastball leaves the bat at 93.0 mph, against 81.5 off his sweeper.

86 and 41 of them thrown.

Contextual Splits

Pitch
Outcome
Batter
Situation
Single
Double
Triple
Home Run
Out
Vs All Pitchers
Player Bio Data
DOB Jun 18, 2001
Birth Place San Jose, CA
Height 6' 0"
Weight 222 lbs LBS
Bats/Throws R/R