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3/28/2013 12:52 P.M. ET

Rockies name Nelson as starting third baseman

SCOTTSDALE, Ariz. -- The closest thing to a position battle in Rockies camp ended Thursday when the club named incumbent Chris Nelson as its starting third baseman and told prospect Nolan Arenado he would begin the regular season at Triple-A Colorado Springs.

The decision left the Rockies needing to determine a backup catcher, a decision between Ramon Hernandez and Yorvit Torrealba; a backup infield spot, between Reid Brignac and Jonathan Herrera; and a bullpen spot, between Manny Corpas and Chris Volstad.

The decisions were expected to come to light after Thursday afternoon's Cactus League finale against the Brewers at Salt River Fields at Talking Stick.

Nelson, 27, batted .301 in 111 games last season, his first as the team's primary third baseman. This spring, Nelson was hitting .265, with both of his home runs coming in the three games leading into Wednesday.

Arenado, who turns 22 on April 16, hit four home runs early in the spring and entered Wednesday hitting .288 with 12 RBIs.

Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.