Doyle Alexander struck out a career-high 11 batters and Damaso Garcia hit a two-run double in a three-run eighth inning in Toronto that led the Blue Jays to a 4-2 victory over the Seattle Mariners last night.

With Toronto trailing, 2-1, in the eighth, Willie Upshaw walked and scored on catcher Ernie Whitt's double. Manny Lee, pinch-running for Whitt, moved to third on a passed ball and remained there after Jesse Barfield's single before Garcia knocked in both runners with his double.

Mike Moore (8-6) was the loser, only his second in six starts since coming off the disabled list June 21. The Mariners lost their eighth in a row against the Blue Jays.

Alexander's previous strikeout high was nine in a relief appearance for Baltimore against Minnesota on Aug. 9, 1974.

"I don't pitch for strikeouts and I really don't care for strikeouts because it makes you throw a lot more pitches," Alexander said. "I got quite a few tonight and that's fine. If I didn't get any, I wouldn't be disappointed."

Alexander (9-6) struck out designated hitter Gorman Thomas four times, on three occasions to end an inning.

Ivan Calderon put Seattle ahead, 1-0, in the fourth inning with his seventh homer. It was the 21st home run given up this season by Alexander, who leads the league in that department.