"Just a little tired, I guess," Hellickson said. "Spring is just really long and I was already at 70 pitches. It usually happens for a lot of guys during Spring Training."
Hellickson, who was acquired from the Rays during the offseason, has already been assured of a spot in the D-backs' rotation.
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.