Detroit Tigers -- Optioned P Mark Grater to Triple-A Toledo. Called up P Kurt Knudsen from Toledo.
Florida Marlins -- Signed IF Kevin Elster to a minor-league contract, and assigned him to Triple-A Edmonton.
San Francisco Giants -- Placed P Trevor Wilson on the 15-day disabled list. Sent OF Dave Martinez to Triple-A Phoenix for rehabilitation assignment.
Texas Rangers -- Announced that C John Russell has cleared waivers and will join the coaching staff as bullpen catcher.
Kansas City Chiefs -- Signed LB Derrick Thomas to a series of four one-year contracts.