The Seattle Mariners are headed to the MLB American League Championship Series for the first time since 2001.

In a thrilling 15-frame extra innings elimination game, the Seattle Mariners defeated the Detroit Tigers 3-2 in Game 5 of the AL Division Series on Oct. 10.

The No. 2 Mariners will face the No. 1 Toronto Blue Jays in Game 1 of the ALCS on Sunday, Oct. 12.

Here's what to know about the 2025 ALCS schedule.

What is the Seattle Mariners 2025 MLB ALCS schedule? Who do the Mariners play next?

The 2025 MLB American League Championship Series is scheduled to begin on Sunday, October 12, according to the MLB postseason schedule .

The Blue Jays hold home-field advantage in the best-of-seven series, which carries a 2-3-2 format.

Here's the schedule of ALCS postseason games:

AL

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