Seattle Mariners right-hander Bryan Woo left his season debut after 4 1/3 scoreless innings Friday night against the visiting Oakland Athletics with an undisclosed injury.

Woo allowed just one hit and left with the Mariners leading 5-0, just two outs shy of qualifying for a victory. Woo missed the start of the season with right elbow inflammation.

After Woo retired Oakland's Tyler Soderstrom on a foul popup to open the fifth inning, Mariners manager Scott Servais, pitching coach Pete Woodworth and a member of the team's training staff came to the mound to check on Woo, who had thrown 62 pitches.

Woo walked off with the trainer and Trent Thornton was called in from the bullpen.

As a rookie in 2023, the 24-year-old Woo was 4-5 with a 4.21 ERA in 18 starts for Seattle.