Delgado's first start will come Friday afternoon against the Rockies at Coors Field.
Delgado was in the conversation for the No. 5 role when Spring Training opened, but seemed ticketed for the bullpen after the D-backs signed free agent Bronson Arroyo a few days into camp.
But when Patrick Corbin hurt his elbow and underwent season-ending Tommy John surgery, the door reopened for Delgado.
"I was trying to be ready for whatever happened," Delgado said. "I've been a starter so I'm not afraid. That's what I like to do."
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.