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Bryce Miller’s scoreless streak ended at 16 innings.
Bryan Woo gave up two runs and two hits in 6 1/3 innings.
The Mariners, who scored a total of nine runs in their previous five games, scored in four of the first five innings and went on to hand the Pirates their 13th loss in 16 games.
The Mariners scored four runs total in the three-game series.
The Justice Department is defending a plea deal it struck with Boeing over planes that crashed and killed hundreds of people.
Mariners starter Bryan Woo allowed four singles and didn’t walk a batter in seven scoreless innings.
Mariners shortstop Luis Rivas pitched a scoreless ninth.
Robles has been a revelation for the Mariners since they signed him on June 4
Luis Castillo had the Mets baffled at times, surpassing 1,300 career strikeouts in the start.
Seattle’s pitching was again terrific, with Miller (9-7) overpowering the Mets before turning it over to the bullpen.