Baltimore Orioles
Placed RHP Kurt Ainsworth (right shoulder surgery), RHP Jason Grimsley (ligament replacement surgery) and OF Val Majewski (left shoulder surgery) on the 15-day disabled list.
Boston Red Sox
Placed RHP Wade Miller, RHP Curt Schilling and OF Adam Stern on the 15-day disabled list.
Detroit Tigers
Outrighted RHP Gary Knotts and LHP Steve Colyer to Triple-A Toledo.
Florida Marlins
Placed RHP John Riedling (shoulder) and RHP Tim Spooneybarger (elbow) on the 15-day disabled list; Assigned INF Wilson Delgado and OF Mark Little to minor league camp.
Kansas City Royals
Placed 3B Chris Truby (wrist) and RHP Scott Sullivan (back) on the 15-day disabled list. Outrighted LHP Chris George to Triple-A Omaha; Sent RHP Dennis Tankersley to Triple-A Omaha.
Los Angeles Dodgers
Acquired nonroster RHP Pat Mahomes from Mets and OF Todd Donovan from Padres for INF Brett Dowdy.
New York Mets
Released nonroster C Kelly Stinnett; Re-assigned 1B Luis Garcia to minor league camp; Optioned RHP Heath Bell and OF Ron Calloway to Triple-A Norfolk.
New York Yankees
Optioned C Wil Nieves and RHP Scott Proctor to Triple-A Columbus; Re-assigned LHP Buddy Groom, INF Damian Rolls, OF Colin Porter, C Joe Depastino, RHP Aaron Small and INF Russ Johnson to minor league camp and will join Triple-A Columbus; LHP Alex Graman cleared waivers and was outrighted to Triple-A Columbus.
Philadelphia Phillies
Placed RHP Vicente Padilla on the 15-day disabled list, retroactive to March 25, with right triceps tendinitis; Purchased the contract of 1B Jose Offerman from Triple-A Scranton.
Pittsburgh Pirates
Placed RHP John Van Benschoten on the 60-day disabled list; Optioned OF Chris Duffy and C Ryan Doumit to Triple-A Indianapolis; Released non-roster OF Ben Grieve.
San Diego Padres
Assigned RHP Tim Stauffer to Triple-A Portland.
Seattle Mariners
Claimed INF Wilson Valdez on waivers from the New York Mets; Placed RHP Rafael Soriano on the 60-day disabled list, recovering from Tommy John surgery; Placed OF Chris Snelling on the 15-day disabled list, retroactive to March 25, with a torn meniscus in his left knee.
Toronto Blue Jays
Placed LHP Ted Lilly on the 15-day disabled list, retroactive to March 25; Released RHP Kerry Lightenberg.
Washington Nationals
Re-assigned INF Carlos Baerga to Minor League camp.