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3/18/2013 7:36 P.M. ET

Skaggs out of fifth-starter race, optioned to Triple-A

GLENDALE, Ariz. -- The battle for the No. 5 spot in Arizona's rotation no longer includes Tyler Skaggs.

The D-backs optioned the left-hander to Triple-A Reno on Monday -- one of five moves the team made.

First baseman Kila Ka'aihue, outfielder Brad Snyder, pitcher Rommie Lewis and catcher Rossmel Perez were all assigned to Minor League camp.

Skaggs struggled this spring, compiling an 11.00 ERA in four appearances. In his nine innings, he allowed 14 hits.

"He just wasn't ready," manager Kirk Gibson said. "We felt it was being counterproductive him being here. I think he was a little bit relieved, to be quite honest with you. We'll get him back on track."

Patrick Corbin and Randall Delgado will now fight for the final rotation spot.

Gibson said he thought some of Skaggs' struggles were the result of him putting too much pressure on himself in trying to win a spot. That led to some mechanical issues, and in turn, command problems.

In nine innings, Skaggs walked eight and struck out five.

"If you can't command your fastball, it's not going to cut it," Gibson said. "He knows what he has to do. We'll get him down there, we'll get him on track, he'll make some adjustments and hopefully he'll relax a little and throw the baseball the way he's capable."

Delgado continues to impress for final rotation job

GLENDALE, Ariz. -- Randall Delgado continued his strong push toward the No. 5 spot in the D-backs' rotation Monday.

The right-hander allowed two runs on six hits in going five innings, and after not pitching well his first two times out, Delgado has put together three straight impressive outings.

"He threw a lot of changeups today," D-backs manager Kirk Gibson said. "He was facing a pretty good lineup today, too. They didn't bite on a lot of stuff early and made him throw his fastball."

Earlier in the day, the club optioned left-hander Tyler Skaggs to Triple-A Reno, which means the final rotation spot will go to either Delgado or Patrick Corbin.

Delgado said he is trying to focus on improving himself and is not worrying about what others are doing. On Monday, that meant using all his pitches.

"I was practicing everything -- curveball, changeup -- and I think it worked," he said.

Delgado had a shutout going through the first four innings before the Dodgers came up with a pair of runs in the fifth.

"He just kind of comes out and does what he has to do," Gibson said. "He's just trying to throw the ball better, he's trying to get more consistent with his pitches. He's close. He's close."

Miley's 'dead arm' shows life in intrasquad game

GLENDALE, Ariz. -- Wade Miley's arm appears to be alive again.

The D-backs left-hander threw two innings in an intrasquad game after being scratched from his last start with what the team referred to as a "dead arm," a point pitchers tend to reach during Spring Training where their arm feels tired.

"He threw the ball well," D-backs pitching coach Charles Nagy said. "It was coming out of his hand very good. Velocity was good and he was able to locate much better."

Miley threw 26 pitches over two innings.

"I could tell his arm was quicker," manager Kirk Gibson said. "Just coming out better and he was free and easy. I think it was a good day for him."

Miley last appeared in a game on March 7 against the Brewers. After being scratched, Miley altered his workout routine a bit and only stopped throwing for a couple of days.

As long as there are no setbacks, Gibson said Miley should be on track to make his first start of the regular season April 3 against the Cardinals.

Steve Gilbert is a reporter for MLB.com. Follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.