Woo allowed four runs on seven hits and a walk while striking out four over six innings in a no-decision versus the Rangers on Sunday.
Woo (8-3) took the loss Tuesday against the Yankees, allowing seven runs on nine hits and a walk while striking out seven over 4.2 innings.
Woo (8-2) picked up the win over the Padres on Wednesday, allowing two runs on two hits and one walk over 6.2 innings while striking out 5.
Woo (7-2) earned the win Thursday, allowing two runs on eight hits over five innings against the A's. He struck out six.
Woo did not factor into the decision in a loss to the Angels on Saturday, allowing four runs on five hits over 6.1 innings. He struck out three.
Woo came away with a no-decision in Wednesday's 3-2 extra-inning loss to the Tigers, scattering four hits over seven scoreless innings. He struck out six without walking a batter.
Woo did not factor into the decision in a win over the Tigers on Thursday, allowing three runs on five hits and one walk over 6.2 innings while striking out seven.
Woo (hamstring) is scheduled to start Friday against the Phillies at T-Mobile Park.
Woo (4-1) got the win over the Astros on Sunday, allowing two runs on four hits while striking out five over 5.2 innings.
The Mariners reinstated Woo (hamstring) from the 15-day injured list ahead of his start Friday against the Angels.