American League

BOSTON RED SOX—Placed RHP David Aardsma on the 15-day DL. Recalled RHP Justin Masterson from Pawtucket (IL).

DETROIT TIGERS—Recalled RHP Zach Miner from Toledo (IL). Optioned OF Jeff Larish to Toledo.

OAKLAND ATHLETICS—Placed 1B Daric Barton on the 15-day DL, retroactive to July 14. Recalled INF Wes Bankston from Sacramento (PCL).

SEATTLE MARINERS—Activated RHP J.J. Putz from the 15-day DL. Optioned LHP Ryan Rowland-Smith to Tacoma (PCL).

TAMPA BAY RAYS—Activated RHP Troy Percival from the 15-day DL. Placed RHP Gary Glover on the 15-day DL, retroactive to July 11.

National League

ARIZONA DIAMONDBACKS—Activated C Chris Snyder from the 15-day DL. Optioned C-INF Robby Hammock to Tucson (PCL).

COLORADO ROCKIES—Optioned INF Jayson Nix to Colorado Springs (PCL). Recalled INF Ian Stewart from Colorado Springs.

HOUSTON ASTROS—Placed RHP Roy Oswalt on the 15-day DL.

LOS ANGELES DODGERS—Signed INF Pablo Ozuna. Designated INF Luis Maza for assignment.

WASHINGTON NATIONALS—Placed 1B Dmitri Young on the 15-day DL.