Harrison's spot in the rotation has been moved to Wednesday against the Diamondbacks, Anthony Andro of FOX Sports Southwest reports. Harrison was activated from the disabled list Saturday with the intention of taking the mound Tuesday, but he'll instead wait an additional day. During his six rehab starts between Double-A Frisco and Triple-A Round Rock, he notched a miserable 6.23 ERA, 1.673 WHIP, and 21:15 K:BB in 34.2 innings.