Shields gives up 1 hit in 3 innings, Moustakas homers in Royals' 6-5 win over Diamondbacks.

Kansas City Royals starting pitcher James Shields pitches to an Arizona Diamondbacks batter during the first inning of an exhibition spring training baseball game Wednesday, March 5, 2014, in Scottsdale, Ariz. (AP Photo/Gregory Bull) (The Associated Press)

Arizona Diamondbacks starting pitcher Patrick Corbin pitches to a Kansas City Royals batter during the first inning of an exhibition spring training baseball game Wednesday, March 5, 2014, in Scottsdale, Ariz. (AP Photo/Gregory Bull) (The Associated Press)

SCOTTSDALE, Ariz. – Kansas City ace James Shields allowed one hit in three scoreless innings and Mike Moustakas hit a three-run homer in the Royals' 6-5 victory over the Arizona Diamondbacks on Wednesday.

A.J. Pollock's leadoff single in the third was the only hit Shields has allowed in four innings this spring. Shields struck out three with no walks.

Patrick Corbin, set to be Arizona's opening-day starter against the Los Angeles Dodgers in Sydney, Australia, on March 22, gave up two runs on four hits in four innings. He struck out four and walked two.

Moustakas' deep shot to right off lefty Joe Paterson was his third homer of the spring. He had four RBIs in the game, giving him 10, most of any player in spring training.