ASTROS -- Purchased contract of former Orioles IF David Newhan from Triple-A Round Rock.
GIANTS -- Recalled OF John Bowker from Triple-A Fresno. Optioned OF Clay Timpner to Fresno.
RANGERS -- Placed P Eddie Guardado on 15-day DL, retroactive to April 5. Activated P Luis Mendoza from 15-day DL.
RAYS -- Transferred P Chad Orvella from 15-day to 60-day DL.
OILERS -- Signed F Robert Nilsson to three-year contract