Skaggs, the D-backs' No. 1 prospect, is competing with Patrick Corbin and Randall Delgado for the No. 5 spot in the rotation. He came on in relief of Ian Kennedy in third inning and failed to complete the inning, leaving with two outs and three runs already having crossed the plate.
"I felt good, arm felt good, just mechanics were all off," Skaggs said. "Just one of those days where you can't throw strikes and you've got to make an adjustment out there, and I couldn't make it."
Skaggs allowed three hits, walked two, threw a wild pitch and balked.
"Fastball was bouncing, I threw my changeup well, my curveball was bouncing, and you can't get by throwing all changeups. I wouldn't say it's attributed to being early in spring, it's just one of those days you can't throw strikes. It's tough to get outs when you can't throw strikes."
D-backs manager Kirk Gibson said it was possible that Skaggs was putting too much pressure on himself to win the No. 5 spot and that the staff would talk with him Friday after looking at video.
In his first outing of the spring, Skaggs allowed four runs (two earned) in 1 2/3 innings.