Thomas White interview: Inside dominant 2025 season, Marlins organizational changes

Alex Carver · August 29, 2025

Swimming Upstream—Episode #67

A very special guest joins Alex Carver and Isaac Azout on Swimming Upstream: Miami Marlins left-hander Thomas White. The consensus top prospect in the Marlins organization since early 2024, White just keeps getting better. This conversation touches on the evolution of his pitch mix, the increasingly analytical approach that the Marlins have applied to player development, relationships with his teammates, his recent 14-strikeout game and more.

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During a 2025 season that's been split between High-A Beloit and Double-A Pensacola, the 20-year-old lefty has made 18 starts, posting a 2.27 ERA, 2.13 FIP and .189 BAA. His 37.5% strikeout rate is third-highest among all minor leaguers with a minimum of 70 innings pitched. For the second consecutive year, White represented the Marlins at the Futures Game.

Both Baseball America and MLB Pipeline currently rank White 21st overall on their respective MLB Top 100 prospects lists. The last Marlins prospect to be so highly regarded by national outlets was Eury Pérez in 2023.

White is a virtual lock to participate in 2026 Marlins big league spring training as a non-roster invitee. Health permitting, he will make his MLB debut before the end of that season.

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