HOUSTON -- Everything was shaping up so well for Bryan Woo and the Mariners during Friday night’s colossal series opener against the Astros that could determine the American League West -- until Seattle’s electric right-hander began his warmup tosses ahead of the bottom of the sixth inning.

Woo exhibited discomfort after a few tosses, none of them appearing with his typical exertion, which prompted an immediate mound visit from manager Dan Wilson and head athletic trainer Kyle Torgerson. And after a brief conferral, Woo walked off the mound and receded into the visiting clubhouse at Daikin Park.

It was unclear what injury Woo suffered or its severity.

Woo had been on cruise control, with just one hit and one walk among the 17 batters he’d faced, while clinging to a 2-0 lead after bo

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