Chicago Cubs
Recalled LHP John Koronka from Triple-A Iowa and optioned RHP Jon Leicester to Triple-A Iowa.
Chicago White Sox
Optioned LHP Kevin Walker to Triple-A Charlotte.
Detroit Tigers
Purchased the contract of SS Tony Giarratano from Double-A Erie and designated INF Jason Smith for assignment.
Houston Astros
Recalled C Humberto Quintero from Triple-A Round Rock and designated C Raul Chavez for assignment.
Los Angeles Angels
Activated RHP Francisco Rodriguez from 15-day disabled list.