The Seattle Mariners star Bryan Woo left Friday’s 4-0 win over the Houston Astros with tightness in his right pectoral muscle, but medical evaluations suggest the injury is not serious.

An MRI taken Saturday morning revealed “minor inflammation,” according to manager Dan Wilson.

The Mariners are treating Woo as day-to-day and will monitor how he responds over the next 24–48 hours.

“It’s really just kind of a day-to-day thing,” Wilson said. “We'll continue to assess it each day. We'll know a little bit more in the next 24-48 hours, depending on how he responds. And that's really what we know at this point.”

If Woo were placed on the 15-day injured list, the earliest he could return would be October 5, the date of Game 2 of the Division Series. That would sideline him for the entire

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