With scheduled starter Paul Clemens dealing with a blister, the Astros will turn to Lucas Harrell to start Sunday's game against the A's.
Harrell has made 21 starts and 11 relief appearances this season, though he has started just twice since July 5. He is 6-15 with a 5.69 ERA, 1.71 WHIP and 79:80 K:BB ratio in 137 2/3 innings. Harrell leads the majors in both losses and walks.