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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
    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
    8.3
    10
    2
    1
    0
    0
    3
    0
    0
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
    9.0
    1
    0
    0.0
    10
    2
    1
    0
    3
    0
    0
    0
    0
    0.100
    0
    Home
    0
    4.1
    1
    0
    0.0
    5
    2
    0
    0
    1
    0
    0
    0
    0
    0.071
    0
    Away
    0
    4.2
    0
    0
    0.0
    5
    0
    0
    0
    2
    0
    0
    0
    0
    0.125
    0
    Day
    0
    2.1
    0
    0
    0.0
    3
    0
    0
    0
    2
    0
    0
    0
    0
    0.222
    0
    Night
    0
    6.2
    1
    0
    0.0
    7
    2
    0
    0
    1
    0
    0
    0
    0
    0.048
    0
    vs Righty
    0
    0.0
    0
    0
    0.0
    1
    1
    1
    0
    3
    0
    0
    0
    0
    0.231
    0
    vs Lefty
    0
    0.0
    0
    0
    0.0
    9
    1
    0
    0
    0
    0
    0
    0
    0
    0.000
    0
    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
    Opponent
    vs AZ 0 2.0 1 0 0.0 3 2 0 0 0 0 0 0 0 0.000 0
    vs NYM 0 2.1 0 0 0.0 3 0 0 0 2 0 0 0 0 0.222 0
    vs BAL 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 TB 0 1.1 0 0 0.0 1 0 0 0 1 0 0 0 0 0.200 0
    Venue
    @ 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
    @ Miami 0 4.1 1 0 0.0 5 2 0 0 1 0 0 0 0 0.071 0
William Kempner

William Kempner Player Profile  

Team Miami Marlins
Birthdate 6/18/2001 (25)
Status MIN
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

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

Marlins Not Ready to Commit to All-Star Despite Breakout Season

Marlins Not Ready to Commit to All-Star Despite Breakout Season

Marlins’ 3.57 ERA Breakout Hurler Placed on IL

Marlins’ 3.57 ERA Breakout Hurler Placed on IL

Marlins Refuse to Trade Breakout Star Amid Fire Sale

Marlins Refuse to Trade Breakout Star Amid Fire Sale

What to Know About Miami Marlins Draft Pick Aiva Arquette

What to Know About Miami Marlins Draft Pick Aiva Arquette

Miami Marlins Could Trade Rising Pitcher to These Four Teams

Miami Marlins Could Trade Rising Pitcher to These Four Teams

Marlins’ DSL Team Makes History in Stunning Victory Not Seen Since 1897

Marlins’ DSL Team Makes History in Stunning Victory Not Seen Since 1897

Marlins Make History—But Not in a Good Way

Marlins Make History—But Not in a Good Way

Marlins Must Draw a Line at One Reported Trade Candidate

Marlins Must Draw a Line at One Reported Trade Candidate

Marlins Make Notable Roster Moves Ahead of Weekend Series, DFA Included

Marlins Make Notable Roster Moves Ahead of Weekend Series, DFA Included

Cubs Projected to Land 25-Year-Old Former Top Pick in Trade

Cubs Projected to Land 25-Year-Old Former Top Pick in Trade

Marlins’ Cy Young Winner Sounds the Alarm After Latest Blowup

Marlins’ Cy Young Winner Sounds the Alarm After Latest Blowup

Marlins’ Rookie Delivers Stoic Quote After Walk-Off Grand Slam

Marlins’ Rookie Delivers Stoic Quote After Walk-Off Grand Slam

Marlins ‘Overhauled’ Player Development Orchestrated By New President

Marlins ‘Overhauled’ Player Development Orchestrated By New President

Meet the Mastermind Behind ‘Torpedo Bats’: Marlins Coach

Meet the Mastermind Behind ‘Torpedo Bats’: Marlins Coach

Son Of Iconic Outfielder ‘Mr. Marlin’ Makes Game Saving Snag In 12 Inning Bout

Son Of Iconic Outfielder ‘Mr. Marlin’ Makes Game Saving Snag In 12 Inning Bout

Yankees Predicted to Pull Off Trade for ‘Electric’ All-Star Reliever

Yankees Predicted to Pull Off Trade for ‘Electric’ All-Star Reliever

Mariners Trade Proposal Lands $2.6 Million Former All-Star in a 4-Player Swap

Mariners Trade Proposal Lands $2.6 Million Former All-Star in a 4-Player Swap

Yankees ‘Have Discussed’ Potential Trade That Brings Marlins Star to NY: Report

Yankees ‘Have Discussed’ Potential Trade That Brings Marlins Star to NY: Report

Marlins Jake Burger Nearly Quit Baseball 5 Years Ago; Now He’s Miami’s Power Threat

Marlins Jake Burger Nearly Quit Baseball 5 Years Ago; Now He’s Miami’s Power Threat

Marlins Star Says Ex-Teammate Was Toxic Presence, Receives Backlash for Comments

Marlins Star Says Ex-Teammate Was Toxic Presence, Receives Backlash for Comments

William Kempner: More News