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William Kempner

Miami Marlins
P
Age: 25
Bats/Throws: R/R
6'0" / 222
DOB: 6/18/2001
(25 years, 4 months, 13 days)
P
Player Dashboard:
Season20262026Total
TeamFGDCMIA- - -
LevelPROJMLBMLB
G2499
GS000
IP24.012.112.1
K%21.0%28.0%28.0%
BB%12.0%8.0%8.0%
GB%30.0%30.0%
ERA4.772.922.92
FIP4.883.343.34
WAR0.00.10.1
2026 Pitch
Selection
FA:48%
SL:22%
SI:15%
FC:13%
RosterResource
Current Role:Injured List:  (RR)
How Acquired:Trade (SFG) Jan'24
Draft:2022, Rd: 3, Pick: 26, Ovr: 106
Draft Team:San Francisco Giants
Signing Bonus:$525,000
College:Gonzaga
Service Time
0.000
MiLB Options
2
News
Rotowire: The Marlins transferred Kempner (elbow) to the 60-day injured list Friday. (8/21/2026)
Injury: Elbow, 60-Day IL
FG
6/18/26
FG
7/9/25
FG
6/30/23
More Articles
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FG
RG
Show
Season20262026Total
TeamFGDCMIA- - -
LevelPROJMLBMLB
G2499
GS000
IP24.012.112.1
K%21.0%28.0%28.0%
BB%12.0%8.0%8.0%
GB%30.0%30.0%
ERA4.772.922.92
FIP4.883.343.34
WAR0.00.10.1
2026 Pitch
Selection
FA:48%
SL:22%
SI:15%
FC:13%
RosterResource
Current Role:Injured List:  (RR)
How Acquired:Trade (SFG) Jan'24
Draft:2022, Rd: 3, Pick: 26, Ovr: 106
Draft Team:San Francisco Giants
Signing Bonus:$525,000
College:Gonzaga
Service Time
0.000
MiLB Options
2
News
Rotowire: The Marlins transferred Kempner (elbow) to the 60-day injured list Friday. (8/21/2026)
Injury: Elbow, 60-Day IL
FG
6/18/26
FG
7/9/25
FG
6/30/23
More Articles
News Settings
Article Source
All
FG
RG
Show
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Splits

Season:
2026
  • Career
  • 2026
    • Splits
    StatsPitch-Level Data
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    Standard

    SeasonHandednessIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026vs L8.2- - -3352044120112.167.242.333.257
    2026vs R3.2- - -173000002012.214.353.214.282
    SeasonHome / AwayIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Home6.25.40306204414018.240.367.440.359
    2026Away5.20.00202000000016.105.150.105.125
    2026Home vs L4.1- - -205204412016.294.400.588.424
    2026Home vs R2.1- - -101000002002.125.300.125.229
    2026Away vs L4.1- - -130000000006.000.000.000.000
    2026Away vs R1.1- - -72000000010.333.429.333.358
    SeasonMonthlyIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026May3.10.00122000000004.167.167.167.148
    2026Jun5.20.00211000002016.056.190.056.144
    2026Jul3.110.80175204412014.357.471.714.499
    20261st Half12.12.925082044140214.182.280.295.265
    SeasonLeverageIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Low Leverage11.0- - -4360022140111.158.256.237.233
    2026Medium Leverage1.1- - -61100000013.200.333.400.332
    2026High Leverage0.0- - -111022000001.0001.0002.0001.261
    SeasonSituationalIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Bases Empty7.0- - -293000003028.125.276.125.215
    2026Men on Base5.1- - -215204411006.250.286.500.336
    2026Men In Scoring2.2- - -91102200005.111.111.222.140
    SeasonThrough CountIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Through 3 - 00.0- - -420000020001.0001.0001.000.794
    2026Through 3 - 10.1- - -62000003000.667.833.667.646
    2026Through 3 - 21.0- - -84102200012.571.625.714.583
    2026Through 2 - 00.2- - -83000003000.600.750.600.596
    2026Through 1 - 04.0- - -194100003010.267.421.333.356
    2026Through 2 - 11.1- - -71000002002.200.429.200.327
    2026Through 1 - 15.2- - -201002211025.059.200.235.210
    2026Through 0 - 17.0- - -2631044110114.125.192.292.216
    2026Through 2 - 21.2- - -82102200013.286.375.429.360
    2026Through 1 - 25.0- - -171102200017.063.118.125.117
    2026Through 0 - 24.1- - -141102200009.071.071.143.090
    SeasonSP / RPIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026As Reliever12.12.925082044140214.182.280.295.265
    SeasonShiftsIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026No Shift0.2- - -42000000000.500.500.500.445
    2026Shift - All6.2- - -255200000000.200.200.280.208
    2026Shift - Traditional6.2- - -233100000000.130.130.174.132
    2026Shift - Non Traditional0.0- - -221000000001.0001.0001.5001.076
    SeasonTTOIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    20261st Through Order as RP12.12.925082044140214.182.280.295.265
    SeasonHandednessIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026vs L8.2- - -3352044120112.167.242.333.257
    2026vs R3.2- - -173000002012.214.353.214.282
    SeasonHome / AwayIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Home6.25.40306204414018.240.367.440.359
    2026Away5.20.00202000000016.105.150.105.125
    2026Home vs L4.1- - -205204412016.294.400.588.424
    2026Home vs R2.1- - -101000002002.125.300.125.229
    2026Away vs L4.1- - -130000000006.000.000.000.000
    2026Away vs R1.1- - -72000000010.333.429.333.358
    SeasonMonthlyIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026May3.10.00122000000004.167.167.167.148
    2026Jun5.20.00211000002016.056.190.056.144
    2026Jul3.110.80175204412014.357.471.714.499
    20261st Half12.12.925082044140214.182.280.295.265
    SeasonLeverageIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Low Leverage11.0- - -4360022140111.158.256.237.233
    2026Medium Leverage1.1- - -61100000013.200.333.400.332
    2026High Leverage0.0- - -111022000001.0001.0002.0001.261
    SeasonSituationalIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Bases Empty7.0- - -293000003028.125.276.125.215
    2026Men on Base5.1- - -215204411006.250.286.500.336
    2026Men In Scoring2.2- - -91102200005.111.111.222.140
    SeasonThrough CountIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026Through 3 - 00.0- - -420000020001.0001.0001.000.794
    2026Through 3 - 10.1- - -62000003000.667.833.667.646
    2026Through 3 - 21.0- - -84102200012.571.625.714.583
    2026Through 2 - 00.2- - -83000003000.600.750.600.596
    2026Through 1 - 04.0- - -194100003010.267.421.333.356
    2026Through 2 - 11.1- - -71000002002.200.429.200.327
    2026Through 1 - 15.2- - -201002211025.059.200.235.210
    2026Through 0 - 17.0- - -2631044110114.125.192.292.216
    2026Through 2 - 21.2- - -82102200013.286.375.429.360
    2026Through 1 - 25.0- - -171102200017.063.118.125.117
    2026Through 0 - 24.1- - -141102200009.071.071.143.090
    SeasonSP / RPIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026As Reliever12.12.925082044140214.182.280.295.265
    SeasonShiftsIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    2026No Shift0.2- - -42000000000.500.500.500.445
    2026Shift - All6.2- - -255200000000.200.200.280.208
    2026Shift - Traditional6.2- - -233100000000.130.130.174.132
    2026Shift - Non Traditional0.0- - -221000000001.0001.0001.5001.076
    SeasonTTOIPERATBFH2B3BRERHRBBIBBHBPSOAVGOBPSLGwOBA
    20261st Through Order as RP12.12.925082044140214.182.280.295.265