"I played one game at third last year in Colorado Springs, but this year I had an idea I was going to do everything," Culberson said. "The first game I made a couple of throwing errors. From then on, I made one error the rest of Spring Training at third. I had 40, 50, 60 innings over there.
"I knew my role was to play wherever they needed me to play. I worked with Stu [Cole, the Rockies' third-base coach] a lot and with Vinny [Castilla, a special assistant] and picked Nolan's brain a lot, too."
Culberson entered the Atlanta series with a .174 batting average but had contributed late in some games, most notably with a walk-off, pinch-hit homer in the ninth inning on May 3 against the Mets.
Rockies manager Walt Weiss has praised Culberson for staying ready offensively. Weiss, who used Culberson in the outfield last year in a pinch, also believed Culberson's athletic ability would play anywhere, third included.
"He's athletic enough, talented enough, that his skill set is in place to be a good defender, so I wasn't too concerned," Weiss said.
Thomas Harding is a reporter for MLB.com. Follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.