Rocker had his scheduled start pushed to Sunday against the Tigers, Kennedi Landry of MLB.com reports.
Cal Quantrill will now serve as the Rangers' starter Saturday while Rocker takes the mound for Sunday's series finale. Rocker is coming off a quality start against the Blue Jays this past Sunday and has a 3.02 ERA, 1.22 WHIP and 43:18 K:BB over his last nine starts (47.2 innings).