The Mariners announced Wednesday that Taijuan Walker will draw the start in Friday's series opener against the Astros in Houston.
Walker hasn't made a start for the Mariners since late July, but he's managed to make three appearances out of the bullpen in September. He owns a 2.96 ERA and 21:15 K:BB ratio in 24 1/3 innings.
The announcement will move Chris Young back to Saturday and Hisashi Iwakuma to Sunday.