Mariners ace Bryan Woo injures pectoral muscle in win

Field Level Media|published: Sat 20th September, 24:27 2025

Sep 19, 2025; Houston, Texas, USA; Seattle Mariners pitcher Bryan Woo (22) throws a fielded ball to first base for an out against the Houston Astros during the second inning at Daikin Park. Mandatory Credit: Erik Williams-Imagn Images

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 lowered his ERA to 2.94. Before Friday, the 25-year-old failed to go at least six innings only twice in 29 starts this year.

In taking the first of the three-game series, the Mariners (85-69) moved a game ahead of the Astros (84-70) for first place in the American League West.

Righty Eduard Bazardo replaced Woo and pitched two innings before Matt Brash and Andres Munoz each threw one inning to complete a three-hit shutout.

--Field Level Media