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William Kempner: Everything you need to know

William Kempner

William Kempner

#71 RP
Miami Marlins

STATS

William Kempner

William Kempner Game Log   2026

  • Regular Season
     
    Date
    Opp
    Result
    IP
    K
    BB
    HBP
    CG
    SHO
    H
    R
    ER
    7/11
    CLE
    L 4-1
    2.0
    3
    0
    1
    0
    0
    3
    2
    2
    7/9
    SEA
    W 8-4
    0.1
    0
    2
    0
    0
    0
    2
    2
    2
    6/15
    PHI
    L 7-0
    2.1
    2
    0
    1
    0
    0
    0
    0
    0
    6/10
    AZ
    W 8-0
    2.0
    3
    2
    0
    0
    0
    0
    0
    0
    6/5
    TB
    L 6-0
    1.1
    1
    0
    0
    0
    0
    1
    0
    0
    5/31
    NYM
    L 10-1
    1.1
    3
    0
    0
    0
    0
    2
    0
    0
    5/30
    NYM
    L 6-1
    1.0
    0
    0
    0
    0
    0
    0
    0
    0
    5/5
    BAL
    L 9-7
    1.0
    1
    0
    0
    0
    0
    0
    0
    0
    Regular Season Totals
    10.4
    13
    4
    2
    0
    0
    8
    4
    4
William Kempner

William Kempner Splits   2026

  • Splits
    GS
    IP
    W
    L
    ERA
    K
    BB
    HBP
    CG
    H
    R
    ER
    SVO
    S
    AVG
    HR
    Overall
    0
    12.1
    1
    0
    0.0
    14
    4
    2
    0
    8
    4
    4
    0
    0
    0.182
    1
    Home
    0
    6.2
    1
    0
    0.0
    8
    4
    0
    0
    6
    4
    4
    0
    0
    0.240
    1
    Away
    0
    5.2
    0
    0
    0.0
    6
    0
    0
    0
    2
    0
    0
    0
    0
    0.105
    0
    Night
    0
    8.0
    1
    0
    0.0
    8
    4
    0
    0
    3
    2
    2
    0
    0
    0.111
    1
    Day
    0
    4.1
    0
    0
    0.0
    6
    0
    0
    0
    5
    2
    2
    0
    0
    0.294
    0
    vs Righty
    0
    0.0
    0
    0
    0.0
    2
    2
    1
    0
    3
    0
    0
    0
    0
    0.214
    0
    vs Lefty
    0
    0.0
    0
    0
    0.0
    12
    2
    1
    0
    5
    4
    0
    0
    0
    0.167
    1
    May
    0
    3.1
    0
    0
    0.0
    4
    0
    0
    0
    2
    0
    0
    0
    0
    0.167
    0
    June
    0
    5.2
    1
    0
    0.0
    6
    2
    0
    0
    1
    0
    0
    0
    0
    0.056
    0
    July
    0
    3.1
    0
    0
    0.0
    4
    2
    0
    0
    5
    4
    4
    0
    0
    0.357
    1
    Opponent
    vs BAL 0 1.0 0 0 0.0 1 0 0 0 0 0 0 0 0 0.000 0
    vs SEA 0 0.1 0 0 0.0 0 2 0 0 2 2 2 0 0 0.667 1
    vs TB 0 1.1 0 0 0.0 1 0 0 0 1 0 0 0 0 0.200 0
    vs AZ 0 2.0 1 0 0.0 3 2 0 0 0 0 0 0 0 0.000 0
    vs ATH 0 1.0 0 0 0.0 1 0 0 0 0 0 0 0 0 0.000 0
    vs PHI 0 2.1 0 0 0.0 2 0 0 0 0 0 0 0 0 0.000 0
    vs CLE 0 2.0 0 0 0.0 3 0 0 0 3 2 2 0 0 0.375 0
    vs NYM 0 2.1 0 0 0.0 3 0 0 0 2 0 0 0 0 0.222 0
    Venue
    @ Miami 0 6.2 1 0 0.0 8 4 0 0 6 4 4 0 0 0.240 1
    @ Athletics 0 1.0 0 0 0.0 1 0 0 0 0 0 0 0 0 0.000 0
    @ Philadelphia 0 2.1 0 0 0.0 2 0 0 0 0 0 0 0 0 0.000 0
    @ New York 0 2.1 0 0 0.0 3 0 0 0 2 0 0 0 0 0.222 0
William Kempner

William Kempner Player Profile  

Team Miami Marlins
Birthdate 6/18/2001 (25)
Status D15
HT/WT 6'0", 222 lbs
Draft Info 2022: Rd 3; Pk 26 (SF)
Birthplace San Jose, CA, USA
Position RP
College Gonzaga

Career History

Miami Marlins 2025-Present (2 seasons)

William Kempner: More News

MLB Trade Rumors: Twins Buxton to Phillies, Red Sox Rumor ‘BS,’ Juan Soto, & Dodgers-Skubal Prediction

MLB Trade Rumors: Twins Buxton to Phillies, Red Sox Rumor ‘BS,’ Juan Soto, & Dodgers-Skubal Prediction

Marlins’ Max Meyer Gets Uncertain Injury Update

Marlins’ Max Meyer Gets Uncertain Injury Update

MLB Trade Rumors: Mike Trout to Red Sox, Blue Jays’ Shane Bieber & the Big Board

MLB Trade Rumors: Mike Trout to Red Sox, Blue Jays’ Shane Bieber & the Big Board

MLB Trade Rumors: Mason Miller to Yankees, Red Sox Targets, & Aaron Judge Update

MLB Trade Rumors: Mason Miller to Yankees, Red Sox Targets, & Aaron Judge Update

MLB Trade Rumors: Mike Trout Phillies Chatter, Adley Rutschman to Yankees & Kevin Gausman’s No-Trade List

MLB Trade Rumors: Mike Trout Phillies Chatter, Adley Rutschman to Yankees & Kevin Gausman’s No-Trade List

MLB Trade Rumors: Yankees & Red Sox Hunter Goodman Bidding War, Bo Bichette to Phillies & Blue Jays-Lindor Link

MLB Trade Rumors: Yankees & Red Sox Hunter Goodman Bidding War, Bo Bichette to Phillies & Blue Jays-Lindor Link

MLB Trade Rumors: Peralta to Cubs, Dodgers Shohei Ohtani, & Red Sox Buying

MLB Trade Rumors: Peralta to Cubs, Dodgers Shohei Ohtani, & Red Sox Buying

MLB Trade Rumors: Yankees & Dodgers Fighting Over Catchers, Skubal Gone & Big Board Update

MLB Trade Rumors: Yankees & Dodgers Fighting Over Catchers, Skubal Gone & Big Board Update

MLB Trade Rumors: Mason Miller Phillies Chatter, Luis Garcia to Red Sox & Lindor Trade Timeline

MLB Trade Rumors: Mason Miller Phillies Chatter, Luis Garcia to Red Sox & Lindor Trade Timeline

MLB Trade Rumors: James Wood to Red Sox, Luke Weaver Chatter, and Every Team’s Trade Assets & Priorities

MLB Trade Rumors: James Wood to Red Sox, Luke Weaver Chatter, and Every Team’s Trade Assets & Priorities

MLB Trade Rumors: Freddy Peralta Bidding War, Luis Arraez to Yankees, & Dodgers Downplaying Skubal

MLB Trade Rumors: Freddy Peralta Bidding War, Luis Arraez to Yankees, & Dodgers Downplaying Skubal

MLB Trade Rumors: Joe Ryan to Phillies, Cubs Seeking Skubal, & No-Trade Clauses

MLB Trade Rumors: Joe Ryan to Phillies, Cubs Seeking Skubal, & No-Trade Clauses

MLB Trade Rumors: Mason Miller to Yankees, All-Star Trade Chips, and Teams Stuck in the Middle

MLB Trade Rumors: Mason Miller to Yankees, All-Star Trade Chips, and Teams Stuck in the Middle

MLB Trade Rumors: Mike Trout to Phillies, Yankees Aaron Judge, & the Big Board

MLB Trade Rumors: Mike Trout to Phillies, Yankees Aaron Judge, & the Big Board

MLB Trade Rumors: Willson Contreras’ Interest, Skubal to Phillies & Blue Jays Pitchers

MLB Trade Rumors: Willson Contreras’ Interest, Skubal to Phillies & Blue Jays Pitchers

MLB Trade Rumors: Blue Jays Trade, Dodgers Deadline Strategy, Sandy Alcantara & Clay Holmes

MLB Trade Rumors: Blue Jays Trade, Dodgers Deadline Strategy, Sandy Alcantara & Clay Holmes

Marlins Make Huge Decision on Their Biggest Star Ahead of Trade Deadline

Marlins Make Huge Decision on Their Biggest Star Ahead of Trade Deadline

MLB Trade Rumors: Tigers Keeping Skubal, Mason Miller Haul & Bo Bichette Opt-Outs

MLB Trade Rumors: Tigers Keeping Skubal, Mason Miller Haul & Bo Bichette Opt-Outs

MLB Trade Rumors: Yankees-Padres Bidding War Looms, Sonny Gray & Byron Buxton

MLB Trade Rumors: Yankees-Padres Bidding War Looms, Sonny Gray & Byron Buxton

Marlins Manager Faces Backlash After Pulling Eury Perez During Perfect Game Bid

Marlins Manager Faces Backlash After Pulling Eury Perez During Perfect Game Bid

Miami Marlins Predicted To Trade Cy Young Winner to NL Central Division Contender

Miami Marlins Predicted To Trade Cy Young Winner to NL Central Division Contender

Sandy Alcantara Named Marlins “Most Coveted” Trade Chip Over $13 Million Arm

Sandy Alcantara Named Marlins “Most Coveted” Trade Chip Over $13 Million Arm

How to Watch Marlins Games Without Cable in 2026

How to Watch Marlins Games Without Cable in 2026

Miami Marlins Announce Kyle Stowers News Before Brewers Game

Miami Marlins Announce Kyle Stowers News Before Brewers Game

Miami Marlins Facing Tough Sandy Alcantara Decision

Miami Marlins Facing Tough Sandy Alcantara Decision

Miami Marlins Officially Announce Signing Of 9-Year MLB Player

Miami Marlins Officially Announce Signing Of 9-Year MLB Player

Marlins’ Owner Bruce Sherman Drops 3-Letter Message About 2026

Marlins’ Owner Bruce Sherman Drops 3-Letter Message About 2026

Marlins Land Affordable Veteran Arm

Marlins Land Affordable Veteran Arm

Marlins See Year 2 Under New Manager as a Turning Point

Marlins See Year 2 Under New Manager as a Turning Point

Marlins Replace Injured Closer with Rays Flamethrower Pete Fairbanks

Marlins Replace Injured Closer with Rays Flamethrower Pete Fairbanks

William Kempner: More News