League: MLB Sport: Baseball Country: United States Category: Scores & Results

Marlins prospect Karson Milbrandt promoted to Triple-A Jacksonville

Yahoo Sports • 1 min read • Latest: Jun 2, 2026, 2:47 AM

Last updated Jun 2, 2026

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Summary

Karson Milbrandt, the Miami Marlins' No. 9 prospect, has been promoted to Triple-A Jacksonville after an impressive season in Double-A, where he recorded a 1.34 ERA and 70 strikeouts over 47 innings. Milbrandt's journey to this point involved significant development following early career struggles, and he has become a standout with a fastball reaching up to 99 MPH and solid secondary pitches. His metrics show a strong ability to miss bats, evidenced by an alarming 42.6% whiff rate this season. Milbrandt's promotion is part of the Marlins' strategy to elevate their top prospects, showcasing his potential as he approaches the major leagues.

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Status Watch

•Karson Milbrandt posted a 1.34 ERA in Double-A.
•He struck out 70 batters in 47 innings this season.
•Milbrandt has improved command metrics and a strong strikeout rate.
•He ranks in the 99th percentile for whiff rate among Double-A pitchers.
•Marlins continue to promote top prospects as part of their strategy.

Latest Updates

2:47 AMYahoo Sports — Another Fish Prospect is Swimming Upstream

What they're saying

"
Some MLB prospects hit the ground running and never look back. Other prospects need time to get their feet wet before becoming hot commodities. Miami Marlins prospect Karson Milbrandt falls into the latter category. After posting a 1.34 ERA with 70 strikeouts in 47 innings in Double-A this season, the Marlins' No. 9 prospect on …
— Yahoo Sports

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