Seattle ace Bryan Woo left his start in the Mariners’ 4-0 road win over the Houston Astros on Friday night due to tightness in a pectoral muscle.

After holding the Astros to one hit over five innings, the right-hander was on the mound warming up for the sixth when, after a throw, he looked down at his glove and appeared to show frustration. Manager Dan Wilson and the team’s training staff came out.

The 2025 All-Star was taken out of the game at that point.

“He just has a little pec tightness,” Wilson told said postgame. “We’ll know tomorrow. Likely an MRI and we’ll get to know a little bit more tomorrow.”

“It was smart that (Woo) let us know and there was no reason to push it. … There’s just too many unknowns at this point.”

Despite leaving early, Woo improved to 15-7 record and lower

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