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Mariners promote pitching prospect Kade Anderson to majors

Published 21 August 2026

The Seattle Mariners are promoting top pitching prospect Kade Anderson to the major leagues, with the left-hander scheduled to make his MLB debut on Saturday, August 22, against the Chicago Cubs at T-Mobile Park. The move, first reported by ESPN's Jeff Passan, comes as the Mariners, currently 60-68 and 4.5 games behind the Houston Astros in the AL West, attempt to bolster their rotation for a late-season push in the American League Wild Card race. Anderson, the third overall pick in the 2025 draft out of LSU, has dominated Double-A this season. In 18 starts for the Arkansas Travelers, he posted a 1.06 ERA and a 0.96 WHIP, striking out 135 batters in 93.1 innings. His performance earned him recognition as one of the top pitching prospects in baseball. The Mariners are skipping him over Triple-A, a decision that underscores their confidence in his readiness. The promotion necessitates a roster move. Seattle will transfer reliever Matt Brash to the 60-day injured list to open a spot on the 40-man roster. Brash has been sidelined with a lat strain for more than 60 days.

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