MLB/Players/William Kempner
William Kempner

WILLIAM KEMPNER

P · Miami Marlins · 20262026 · 9 games
9
CAREER GAMES · REGULAR SEASON
1 season
2.92
CAREER ERA
12.1 innings · 14 strikeouts
1-0
CAREER RECORD
WHIP 0.97

01/Pitching

Season by season
Regular season
SeasonClubGWLIPHERBBSOHRERAWHIP
2026MIA91012.18441412.920.97
Career91012.18441412.920.97

04/Every pitch

2026 Regular season
Play log from 2015
Pitch locations · 199 pitches
Called strike (36) Swinging strike (31) In play (30) Foul (30) Ball (72)

Catcher’s view · the zone drawn is the average of the 199 batter zones recorded here, 1.62 to 3.21 feet

Pitch mix
PitchNShareMPHRPMStrike%
Four-Seam Fastball9648.2%95.52,39553.1%
Sweeper4422.1%81.62,90645.5%
Sinker2914.6%94.02,25231.0%
Cutter2512.6%87.32,62364.0%
Changeup52.5%86.81,34520.0%

05/Game log

2026
Regular season
DateOppResultIPHERBBSO
MAY 5vs BALL 791.00001
MAY 30@ NYML 161.00000
MAY 31@ NYML 1101.12003
JUN 5vs TBL 061.11001
JUN 10vs AZW 802.00023
JUN 15@ PHIL 072.10002
JUL 3@ ATHW 1251.00001
JUL 9vs SEAW 840.12220
JUL 11vs CLEL 142.03203

Regular season and postseason are separate tables and are never summed into one career line; spring training is excluded entirely. Hitting and pitching come from different source rows, so a two-way player has both tables and neither borrows from the other. Innings pitched is summed as outs and converted once: the stored value counts thirds, so “6.1” means six innings and one out, and adding those as decimals understates a career. ERA and WHIP are computed from those totals rather than averaged across seasons. On-base percentage is (H + BB) over (AB + BB), which runs slightly under the official figure because the source rows carry no hit-by-pitch or sacrifice fly. The charts cover 2015 onward only, and the spray chart plots batted balls with a recorded landing spot: a strikeout or a walk has no location and is not a missing dot. Its field is a representative park, not the one the ball was hit in, because a spray chart pooled across a season is hit in thirty different outfields.