OAKLAND — After losing their first, second and third options to play center field to injury, the A's felt they had to make a move. So they acquired Ryan Langerhans from the Atlanta Braves on Sunday for a player to be named. Langerhans will start in center field Tuesday against the Boston Red Sox.

"He's a player we liked in the past," A's general manager Billy Beane said. "He can play all three outfield positions. He plays hard, knows how to play the game."

Langerhans was Atlanta's starting left fielder the past two years. With Andruw Jones on the team, they did not need him to play much center. Langerhans hit .267 with eight home runs in 326 at-bats in 2005 and .241 with seven homers in 315 at-bats in 2006. He is off to a slow start this season, batting .069 with three hits in 44 at-bats.

To make room for Langerhans, the A's sent Dallas Braden, Sunday's starter and losing pitcher, to Triple-A Sacramento. Joe Kennedy will start in Braden's place on Saturday.

After Mark Kotsay, Milton Bradley and Nick Swisher all went down to injury, the A's had to turn to Shannon Stewart and Danny Putnam to play center field.

Stewart made his second start in center field Sunday after not having played there in eight years.

"He did great," manager Bob Geren said. "Shannon's a good athlete. He can do anything."

MORE MOVES ON THE WAY: Bobby Kielty, who left Saturday's game with a calf strain, was fairly glum before Sunday's game regarding his chances of playing again soon. He seemed resigned to the possibility of being placed on the disabled list.

"I wasn't able to do what I wanted to do," Kielty said. "I ran before the game, and it was fine. Maybe fatigue set in. During the game, running the bases it tightened up on me."

Geren said no roster move would be made Sunday.

"By Tuesday it's a possibility," Geren said. "We have to figure out how bad Kielty's calf is, whether to have him rest a few more days or DL him."

Geren said Nick Swisher (hamstring) will not be put on the disabled list.

ONE-HOPPERS: The A's went 1-4 on the homestand ... The Devil Rays won their first road series since June 16-18, 2006, in Philadelphia. ... The home run hit by B.J. Upton was his fifth in 72 at-bats. He had five career home runs in 334 at-bats going into the season.