Rocker will start Sunday's game against Toronto rather than follow an opener, Shawn McFarland of The Dallas Morning News reports.
Rocker worked behind an opener in his most recent appearance and pitched well, allowing two runs over five innings while striking out nine. Despite that success, the Rangers will go back to deploying Rocker as a traditional starter Sunday. Over 13 starts this season, Rocker has posted a 4.70 ERA, 1.48 WHIP and 49:27 K:BB across 61.1 frames.