Escobar was optioned to Triple-A Reno on Sunday.
Although the Diamondbacks are hurting for rotation depth, Escobar is headed back to the minors after a three-day stint in the majors that included just one relief appearance. He has a 15.95 ERA for the Diamondbacks (7.1 innings) and a 5.08 ERA for Triple-Reno (56.2 innings).