What happened: Los Angeles Dodgers reliever Blake Treinen left Saturday's 4-3 win in the seventh inning after his shoulder flared up while warming up in the bullpen. Brock Stewart entered in his place before Treinen walked to the dugout with a member of the training staff.

Why it matters: Manager Dave Roberts told reporters the team believes the injury is season-ending, characterizing it as a recurrence of the shoulder issue that previously landed him on the injured list. The injury removes a veteran arm from the Los Angeles bullpen just days ahead of the postseason.

What to watch: Treinen will undergo further imaging to determine the exact severity of the shoulder injury.