The Mariners are done waiting on their best arm. ESPN's Jeff Passan reported Thursday night that Seattle plans to call up left-hander Kade Anderson, the consensus top pitching prospect in the sport, to make his major league debut Saturday.
BREAKING: The Seattle Mariners plan to call up left-hander Kade Anderson, the top pitching prospect in baseball, to start Saturday, sources tell ESPN. Anderson, the third pick in the 2025 draft, has a 1.06 ERA over 93.1 innings with 135 strikeouts, 13 walks and 47 hits allowed.
The numbers behind the promotion are absurd. Anderson posted a 1.06 ERA over 93.1 innings for Double-A Arkansas, striking out 135 batters against just 13 walks while allowing a mere 47 hits. He went 10-1 across 18 starts and held opponents scoreless in 13 of them. That's not a prospect trending up — that's a guy who's already broken the level he's playing at.
Anderson isn't some late-blooming find, either. Seattle took him third overall in the 2025 draft out of LSU, where he helped lead the Tigers to a College World Series title, and signed him for an $8.8 million bonus. He's making the jump to the majors after pitching at just one minor league level all year, bypassing Triple-A entirely — a fast track usually reserved for the truly elite.
The timing says a lot about where the Mariners are. At 60-68, Seattle is having one of the more disappointing seasons in baseball after reaching the ALCS a year ago, and its rotation has slipped to fifth in the AL with a 3.83 ERA. Anderson's debut against the Cubs at T-Mobile Park won't single-handedly fix the standings, but it's a jolt of talent the roster badly needed, and a look at who's supposed to anchor this staff for years.
For fantasy and betting markets, this is about as high-profile a debut as it gets — the No. 1 pitching prospect in baseball, with elite strikeout stuff and a walk rate that borders on unfair, getting thrown into a live rotation spot with zero Triple-A seasoning. Expect his Saturday start to draw more attention than most September call-ups get all month.