Overview
- Bo Bichette was omitted after showing visible discomfort in a baserunning test Saturday, a month after spraining his left knee in a Sept. 6 collision.
- Seattle included All-Star Bryan Woo on its 26-man roster, with team leadership indicating he is expected to be available closer to the middle of the series.
- Bryce Miller will open Game 1 for the Mariners on three days' rest against Gausman at Rogers Centre on Sunday night.
- The Blue Jays added veteran starters Scherzer and Bassitt for the best-of-seven, replacing relievers Justin Bruihl and Tommy Nance on a 13-pitcher, 13-position-player split.
- Seattle also added utilityman Miles Mastrobuoni and set a 13–13 roster after a 15-inning ALDS clincher that left early-series rotation plans fluid.