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06/15/08 4:01 PM ET

Rosales called up, Buckner back down

Righty relievers swap spots to bolster beleaguered bullpen

PHOENIX -- Just two days after the Diamondbacks called up right-hander Billy Buckner, he was optioned back down to Triple-A Tucson to make room for another righty, Leo Rosales.

The D-backs bullpen has pitched a total of 24 1/3 innings the past five days, including three consecutive extra-innings games.

As was the case on Friday with Buckner, the move was made to give the 'pen a fresh arm.

"The bullpen is kind of hurting a little bit, so I'm just going in to help out a little bit," Rosales said. "I didn't expect [the call up] at all."

Buckner pitched twice for Arizona. In his first outing on Friday, he picked up the win against Kansas City after pitching a scoreless 10th inning. On Saturday, he threw 1 2/3 innings and allowed back-to-back homers.

Rosales saw action in 28 games in relief for the Sidewinders, going 2-1 with a 4.08 ERA in 35 1/3 innings. He went 9-for-9 in save opportunities. Rosales will be making his Major League debut with the D-backs.

Rosales said the club told him they may end up needing him for a while, or he might just be an innings-eater for the next few days.

The 27-year-old right-hander was acquired from the Padres last July in exchange for Scott Hairston in a rare trade within the division. While with the Padres, Rosales was described as having the best changeup in their farm system.

Mike Ritter is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.