Hisashi Iwakuma had his way with the Phillies on Tuesday, striking out 11 in eight scoreless innings.
The Mariners have adjusted their rotation so that Hisashi Iwakuma will start Sunday against the Red Sox.
Hisashi Iwakuma struck out five Blue Jays in firing 6 2/3 shutout innings in Wednesday's 2-0 win.
Hisashi Iwakuma pitched seven innings of one-run ball Friday as the Mariners beat the White Sox.
Hisashi Iwakuma allowed only a solo home run over 7 2/3 innings but suffered the loss against the Orioles on Sunday.
Hisashi Iwakuma improved to 9-5 after holding the Indians to two runs over seven innings in Tuesday's win.
Hisashi Iwakuma gave up four runs on seven hits over seven innings in a loss to the Orioles on Thursday.
Hisashi Iwakuma has had his next start pushed back to Thursday against the Orioles.
Hisashi Iwakuma just missed out on a shutout Saturday, allowing two runs over 8 2/3 innings in a win over the A's.
Hisashi Iwakuma struck out 10 Twins in firing seven shutout innings in Monday's 2-0 win.
Hisashi Iwakuma held the Astros to one run on seven hits over six innings in Tuesday's win.
Hisashi Iwakuma was lit up for five runs on eight hits over just four innings in a loss against the Red Sox on Wednesday.
Mariners manager Lloyd McClendon said Tuesday that Hisashi Iwakuma's stiff neck is still "not 100 percent."
Hisashi Iwakuma gave up five runs on nine hits over five innings in a no-decision against the Royals on Friday.