SEATTLE — The American League Championship Series between the Seattle Mariners and Toronto Blue Jays is guaranteed to extend at least through Game 5.

The Blue Jays guaranteed a Game 5 after a 13-4 win in Game 3 of the ALCS on Wednesday at T-Mobile Park in Seattle.

Luis Castillo will start for the Mariners in Game 4 of the ALCS at 5:33 p.m. PT on Thursday. Before Game 4, Seattle manager Dan Wilson announced Bryce Miller would be the starting pitcher for Game 5.

Miller was the first M's pitcher to start in the series and allowed just one earned run on two hits (one home run) in six innings pitched in Game 1.

The announcement came with the question as to where that left 2025 All-Star starting pitcher Bryan Woo.

Woo has been out since Sept. 19 due to right pectoral inflammation. He was left off the American League Divisional Series roster but included on the ALCS one.

Before Game 4 of the ALCS on Thursday, Wilson announced Woo would be available out of the bullpen going forward.

"It's a different kind of a role. He had a chance to do it in the All-Star Game, so maybe a little bit of experience in coming out of a (bullpen)," Wilson said in a news conference Thursday. "This is the time of year where you ask people to do things they're not as comfortable doing or they haven't done as much. But he's got a wealth of people that will help him. (Luis Castillo) and Logan Gilbert did it recently, they can help. I think he'll be in good shape and I think he's excited to go back out there."

Going into the postseason, there was the assumption that, when healthy, the rotation would be Woo, Gilbert, Castillo and George Kirby with Bryce Miller potentially coming out of the bullpen.

Woo's injury and Miller's performance in two postseason starts (2.61 ERA, five strikeouts, three earned runs allowed in 10.1 innings pitched) nixed those plans.

Wilson didn't say what situation Woo would make his playoff debut in, or the number of pitches he'd be limited to. Gilbert and Castillo both pitched out of the bullpen in extra innings in Seattle's 15-inning win in Game 5 of the ALDS against the Detroit Tigers on Oct. 10.

Miller expressed confidence Woo will be able to perform despite the unfamiliar situation and the latter's month-long layoff.

"(Woo) basically — him and (Castillo) — held it down for (me, Gilbert and Kirby) for the majority of the year. Now it's been our turn to pick him up and hold it down while he's been gone. ... I don't think he's gonna try and do anything more knowing he has a lower pitch count.

"Over the last few years, he's been really good. Even when he's been lower-90s and he's been really good in upper-90s. With the uniqueness of his deliver and his fastball, (he's able to) tear through lineups even when he's not feeling good. He threw one inning in the All-Star Game and was 97, 98 (mph) and was untouchable. He's gonna go out there and do what he does."

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