Atlanta Braves
Activated C Johnny Estrada from the 15-day disabled list and optioned C Brayan Pena to Triple-A Richmond.
Baltimore Orioles
Claimed RHP James Baldwin off waivers from the Texas Rangers and transferred OF Eli Marrero from the 15-day to the 60-day disabled list.
Colorado Rockies
Placed OF Larry Bigbie on the 15-day disabled list retroactive to Aug. 21 with a strained right Achilles' tendon; Recalled OF Choo Freeman from Triple-A Colorado Springs.
Los Angeles Dodgers
Placed LHP Odalis Perez on the 15-day disabled list, retroactive to Aug. 18, with a strained right oblique muscle; Recalled RHP Edwin Jackson from Double-A Jacksonville and optioned RHP Jonathan Broxton to Double-A Jacksonville.
New York Mets
Recalled RHP Heath Bell from Triple-A Norfolk and designated OF Ron Calloway for assignment.
Pittsburgh Pirates
Placed INF Jose Castillo on the 15-day disabled list with an injury to his left knee and recalled INF Ty Wigginton from Triple-A Indianapolis.