The Diamondbacks announced on Monday morning that they have optioned LHP Tyler Skaggs to Triple-A Reno. The team also reassigned INF Kila Ka’aihue, LHP Rommie Lewis, C Rossmel Perez and OF Brad Snyder to minor league camp.

Skaggs entered spring training as perhaps the leading candidate to win the No. 5 starter’s job, but he’s looking more and more like a long shot with each ineffective outing.

In five appearances, Skaggs has allowed 16 runs (11 earned) in 12 innings. He gave up five runs (two earned) on three hits and four walks in 2 2/3 innings on Saturday against the San Diego Padres.

Manager Kirk Gibson said Skaggs has “certainly pressed from the day he came in here” and that still might be thinking too much on the mound.

“He’s young and has a lot to learn,” Gibson said. “If he goes through this, it’ll be good for him in the end. He’ll learn how to deal with it. But right now, he’s just struggling. He’s struggling. We’ll get him turned around.”

Skaggs was more focused early Sunday, as he started off well before running into trouble in his third inning. He said he was unable to make the proper adjustment but still believes he’s making progress.

“I thought I threw the ball well,” he said. “It’s not the results that I want. It is what it is. I’m not too worried about it, honestly. I’m still throwing the ball well. The good thing is that I’m healthy, no arm problems, and I’m still throwing well.”

Still, Skaggs acknowledged it’s frustrating to not be getting the same results as left-hander Pat Corbin and right-hander Randall Delgado, the other pitchers he’s competing with for the fifth spot. Corbin, the clear front-runner for the job, gave up one run in 4 2/3 innings on Sunday, lowering his Cactus League ERA to 3.68.