HOUSTON (AP) — Seattle right-hander Bryan Woo exited the Mariners’ 4-0 win over the Houston Astros with pectoral tightness after throwing a couple of warmup pitches in the sixth inning on Friday night.

Shortly after Woo started warming up on the mound for the sixth, a team trainer and coaches came out. After a brief discussion, the All-Star exited with the trainer and Eduard Bazardo replaced him.

“He had a little pec tightness,” manager Dan Wilson said after the Mariners' victory, which vaulted them into first place in the AL West. “He kind of gave us a heads-up and that was why Bazardo was getting loose. We will know more tomorrow. Likely an MRI, and we will get to know a little bit more tomorrow, but that’s all we know at this point.”

Woo said he “felt a little tightness” but came o

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