"I thought he was great over there," said manager Bob Melvin. "His actions are all good. I hope he had some fun out there. It looked like it."
Callaspo was kept plenty busy. Starter Scott Kazmir induced four straight groundball outs to start the game and also forced a double-play ball in the third. By day's end, Callaspo was part of five plays in as many innings.
The 30-year-old, a potential platoon partner with Brandon Moss at the position, was using Daric Barton's first baseman's glove but noted his own was on its way.
"It was good," he said. "It was kind of weird the first time."
"Yeah, it was a little odd seeing him over there," said third baseman Josh Donaldson. "But once you throw the first one over to him, it's fun.
"I play catch with him all the time, so it shouldn't be that tough for me, I guess. And for him, he's an infielder, and first base isn't that difficult. It's the easiest position on the field, so I'd expect him to have a pretty easy transition, especially since he's already played a corner before."
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.