Chicago White Sox
Recalled 1B/DH Frank Thomas from Triple-A Charlotte and reinstated him from the 15-day disabled list.
Colorado Rockies
Placed RHP Jose Acevedo on the 15-day disabled list (strained right groin) and purchased the contract of RHP Matt Anderson from Triple-A Colorado Springs; Transferred LHP Matthew Merricks to the 60-day disabled list.
Kansas City Royals
Terminated the contract of hitting coach Jeff Pentland and replaced him with Minor League hitting instructor Andre David.
Los Angeles Dodgers
Purchased the contract of C Mike Rose from Triple-A Las Vegas and optioned C Dioner Navarro to Las Vegas; Designated RHP Buddy Carlyle for assignment.
Oakland Athletics
Reinstated SS Bobby Crosby from the 15-day disabled list and optioned 2B Keith Ginter to Triple-A Sacramento.
Seattle Mariners
Optioned C Miguel Olivo to Triple-A Tacoma; recalled Rene Rivera from Double-A San Antonio.
Tampa Bay Devil Rays
Recalled RHP Chad Orvella from Double-A Montgomery.
Toronto Blue Jays
Activated OF Frank Catalanotto from the Bereavement List and optioned OF Gabe Gross back to Triple-A Syracuse.
Washington Nationals
Activated RHP John Patterson and 1B Wil Cordero from the 15-day disabled list; Optioned OF Tyrell Godwin and INF Brendan Harris to Triple-A New Orleans.