Baltimore Orioles
Optioned OF Napoleon Calzado to Triple-A Ottawa.
Chicago White Sox
Sent RHP Kris Honel outright to Double-A Birmingham.
Colorado Rockies
Placed OF Matt Holliday on the 15-day disabled list, retroactive to June 9, with a fractured right pinkie finger and recalled OF Jorge Piedra from Triple-A Colorado Springs.
Houston Astros
Recalled RJP Mike Burns from Triple-A Round Rock and optioned OF Todd Self to Round Rock; C Raul Chavez cleared waivers and accepted an outright assignment to Round Rock.
Los Angeles Angels
Activated OF Vladimir Guerrero from the 15-day disabled list and placed RHP Kelvim Escobar on the 15-day disabled list, retroactive to June 9, with a bone spur in his right elbow.
Milwaukee Brewers
Optioned OF Dave Krynzel to Triple-A Nashville and purchased the contract of INF Rickie Weeks from Nashville. Acquired RHP Tomo Ohka from the Washington Nationals in exchange for INF Junior Spivey.
Texas Rangers
Placed RHP Nick Regilio on the 15-day disabled list with elbow soreness, recalled RHP Juan Dominguez and purchased the contract of LHP C.J. Wilson from Double-A Frisco; Optioned LHP Michael Tejera to Triple-A Oklahoma.
Washington Nationals
Outfielder Jeffrey Hammonds announced his retirement. Acquired 2B Junior Spivey from the Milwaukee Brewers in exchange for RHP Tomo Ohka; Claimed RHP Ryan Drese off waivers from the Texas Rangers and RHP Jacobo Sequea off waivers from the Baltimore Orioles and optioned him to Double-A Harrisburg.