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 low

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