Feliz, who has played 95 games at first base in his career, has been working out at first base this week and started at first in Thursday's Grapefruit League finale at Osceola County Stadium. He hasn't played first base since 2007, but said he's comfortable at the position.
"For me, it's all the same between the lines," Feliz said. "It's all about the fundamental stuff. I'm going to get ground balls, and I'm going to be ready."
Feliz played 12 games at first in 2003, 67 in '04, 12 in '05 and four in '07. The Astros plan to start Feliz at first against lefties, with Chris Johnson starting at third base. Geoff Blum will typically start at first against right-handers, with Feliz at third. The Astros could face as many as three left-handers in the first week of the season: Barry Zito, Cole Hamels and Jamie Moyer.
"He's played there quite a few times, of course, with San Francisco over the past few years," manager Brad Mills said of Feliz at first. "He was very receptive to going over there and worked out at first base for a few days last week when we were on the road. He worked out over there, did some drills with us two days ago at first base. We'll play him a few innings there today and go from there."