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George Springer homered on the first pitch from Miller, who then escaped a two-on jam in a 27-pitch first inning.
Vince Dunn and Jared McCann also scored for the Kraken, who had gone 0-3-1 in their previous four openers, including a 5-4 overtime loss to Anaheim in 2022.
Game 5 is in Seattle on Friday.
Seattle RHP Bryce Miller are expected to start Game 4 on Wednesday.
Darnold and Mayfield combine for 720 yards, just 10 incompletions
Logan Gilbert scheduled to start game 3 Tuesday in Detroit
M’s will face Tigers’ ace Skubal in Sunday’s game 2
AL West champion Seattle had some extra time off, but the status of All-Star right-hander Bryan Woo (15-7, 2.94 ERA) was still uncertain.
The Mariners will take on the winner of the first-round series between the Detroit Tigers and Cleveland Guardians in the AL Division Series starting Saturday.
RHP George Kirby (10-7, 4.24) starts Friday’s series opener against the visiting Los Angeles Dodgers, who send RHP Emmet Sheehan (6-3, 2.86) to the mound,