The Diamondbacks optioned Del Castillo to Triple-A Reno on Wednesday, Jody Jackson of Bally Sports Arizona reports.
Del Castillo will give up his spot on the 26-man active roster to Gabriel Moreno (personal), who was reinstated from the paternity list. After getting a call-up to Arizona following the All-Star break, Del Castillo went 7-for-25 with one steal and one RBI in eight games. He'll see more consistent playing time at Triple-A.