Mariners ace Bryan Woo left off ALDS roster

Adam Jude, The Seattle Times on Oct 4, 2025

Published in Baseball

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SEATTLE — The Mariners will begin their playoff push against the Detroit Tigers without their young ace.

Bryan Woo, out for the past two weeks with pectoral inflammation, has been left off the Mariners’ 26-man roster for the American League Division Series, MLB sources with knowledge of the club’s plans told The Seattle Times.

The Mariners host the Tigers for Games 1 and 2 this weekend at T-Mobile Park.

Woo, a first-time All-Star this summer, emerged as one of the premier pitchers in the AL this season, going 15-7 with a 2.94 ERA over 30 starts in a career-high 186 2/3 innings. He struck out 198, walked 36 and had a 0.927 WHIP.

Woo’s 3.21 career ERA as the best in franchise history for a pitcher with at least 70 starts.

Woo will not be eligible to pitch until the AL Championship Series next week, should the Mariners advance past the ALDS.

The club is optimistic Woo will be available in the ALCS if they do advance.

Woo also struck a hopeful tone in an interview Thursday, after he threw off a mound for the first time since exiting his Sept. 19 start in Houston after five shutout innings.

Woo said the issue now isn’t as much about his pectoral muscle but more about building back arm strength to handle a starter’s workload.

During his work off the mound Thursday, Woo threw 15 pitches at roughly 80-90% intensity. The plan is for him to gradually build up toward 100% over the next week.

“Obviously, you don’t want to take huge, huge jumps [with intensity]. You’ve got to be smart with it,” Woo said. “Hopefully we just keep progressing like we have been.”

Without Woo, the Mariners named George Kirby and Luis Castillo the starters for Saturday's Game 1 and Sunday's Game 2, respectively.

Logan Gilbert is expected to start Game 3 in Detroit on Tuesday. Bryce Miller could be in line to start Game 4, though the Mariners have not finalized those plans yet.

“My job, it's just control what I can control every day," Woo said Thursday. "I'll do my stuff from when I get to the field early get everything done before the game starts. And then I have all the faith in the world with all of our pitchers — starters, relievers, whoever it is. They're more than capable than doing the job like they have been all year."