The Seattle Mariners play their next game on Sunday, October 12, 2025, against the Toronto Blue Jays at 8:03 PM ET. This game is the first game of the American League Championship Series (ALCS) and will be held at the Rogers Centre in Toronto. The Mariners will continue their ALCS series with the Blue Jays, with subsequent games scheduled on October 13 in Toronto and then October 15 and 16 back in Seattle at T-Mobile Park.