"I started just getting ahead with my fastball and then going to my slider," Corbin said. "Early on, I was kind of throwing my slider earlier in counts. I just talked to [pitching coach Mike Harkey] about it, and it was just something we tried to make an adjustment for in the third inning and just attacked with my fastball."
Corbin has one more start, Saturday against the Indians in Goodyear, before he pitches the regular-season opener against the Dodgers on March 22 in Sydney, Australia.
"I feel like I'm ready and where I need to be," Corbin said.
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.