Kluber starts in the series opener against the Rays. He’s coming off a pair of dominant performances in which he's allowed just one run on four hits over 13 2/3 innings.
Castillo started Saturday night against the Orioles, pitching a scoreless first. He is 1-1 with a 2.25 ERA in his last 14 appearances (five starts), including 12 scoreless outings, after allowing nine runs in five appearances from July 15-29.