MLB Miami Marlins William Kempner

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William

Kempner

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William Kempner

MIA Relief Pitcher #71
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Marlins placed RHP William Kempner on the 15-day injured list with a right elbow sprain.

No word yet on how long the 25-year-old hurler will be sidelined for. Kempner was excellent in nine appearances for the Marlins, posting a 2.92 ERA, 0.97 WHIP and a 14/2 K/BB ratio across 12 1/3 innings in his nine appearances. Dax Fulton was recalled from Triple-A Jacksonville in a corresponding move to take his place in the Marlins’ bullpen.
- David Shovein

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William Kempner

MIA Relief Pitcher #71
Player Stats

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Marlins recalled RHP William Kempner from Triple-A Jacksonville.

He’ll take the place of Ryan Gusto after the right-hander was optioned to Triple-A on Friday. Kempner has been outstanding in six appearances with the Marlins this season, firing nine scoreless innings with a 0.56 WHIP and a 10/2 K/BB ratio. He adds another multi-inning option to a bullpen that has been taxed recently.
- David Shovein

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William Kempner

MIA Relief Pitcher #71
Player Stats

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Marlins optioned RHP Will Kempner to Triple-A Jacksonville.

Kempner has been excellent since being recalled from Triple-A at the end of May and hasn’t allowed an earned run. He will assuredly be back before the summer ends, but Miami needs a multi-inning option, so Dax Fulton takes Kempner’s place on the roster.

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William Kempner

MIA Relief Pitcher #71
Player Stats

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Marlins recalled RHP William Kempner from Triple-A Jacksoville.

Kempner tossed a scoreless inning against the Orioles during his big-league debut back on May 5. The 24-year-old gets the call to rejoin Miami’s bullpen in place of an injured Andrew Nardi (ribs). He’s compiled a 4.56 ERA, 1.21 WHIP and 46/16 K/BB ratio over 25 2/3 innings at the Triple-A level this season.

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William Kempner

MIA Relief Pitcher #71
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Marlins optioned RHP William Kempner to Triple-A Jacksonville.

Kempner heads back to the minors after tossing a scoreless inning during his lone appearance for the Marlins after being called up earlier this week. The 24-year-old figures to return to Miami at some point later this season.

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Dax Fulton

MIA Starting Pitcher #90
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Marlins optioned LHP Dax Fulton, RHPs Will Kempner and Josh White, INFs Deyvision De Los Santos and Jared Serna to Triple-A Jacksonville; Reassigned RHP Nigel Belgrave and INF Dylan Jasso to minor league camp.

We’re still early enough in camp that teams aren’t faced with difficult decisions just yet, so there are no surprises here. Fulton, 26, had a particularly brutal 2025 season, registering a 5.38 ERA, 1.62 WHIP and a 115/59 K/BB ratio over 103 2/3 innings between Double-A Pensacola and Triple-A Jacksonville. He’ll continue to operate as extra pitching depth for the Fish.

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William Kempner

Josh White

Nigel Belgrave

Dylan Jasso
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Joe Mack

MIA Catcher #96
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Marlins selected the contract of C Joe Mack, RHP Will Kempner and RHP Josh White from Triple-A Jacksonville.

A phenomenal defender behind the plate, Mack projects as Miami’s catcher of the future and should enter spring training with a chance to seize the starting role. Agustín Ramírez offers a much higher offensive upside, but his omnipresent defensive challenges make him more of a long-term fit at DH.

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Josh White

William Kempner
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William Kempner

MIA Relief Pitcher
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Marlins acquired RHP William Kempner from the Giants for international bonus pool money.

The move will help the Giants sign their IFA class, and it’s worth noting they signed one of the biggest names in the class in Josuar De Jesus Gonzalez. Kempner is a former third-round selection out of Gonzaga who missed the 2024 season due to injury, and he’ll likely pitch at the upper levels for the Marlins assuming good health.

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