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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.
The Capitol building is back open to the public, but certain spaces are closed off as the damage starts to get repaired.
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.