Trevor Cahill will start Thursday's 1:10 p.m. MT matchup against the Rockies, with Vidal Nuno, Archie Bradley, Oliver Perez, Evan Marshall and J.C. Ramirez following him to the hill.
D-backs manager Chip Hale has been impressed with the way Cahill, who is competing for a rotation spot, has looked in bullpen and live batting practice sessions.
"We've noticed the ball coming out of his hand much better," Hale said. "It's just a matter of now seeing it translate to a game. If we see what we've seen in the bullpen he'll be one of our five, no doubt. We're excited about what we're seeing so far."
Left-hander Robbie Ray will start Friday against the A's, 1:10 p.m. MT at Salt River Fields.
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.