The Oakland Athletics activated infielder Adam Rosales from the 60-day disabled list Monday and recalled infielder Scott Sizemore from Triple-A Sacramento.
The Oakland Athletics announced that Dallas Braden is expected to miss the rest of the year. The diagnosis came after Braden had surgery Tuesday to repair a torn capsule in his left throwing shoulder.
Braden, who pitched a perfect game against Tampa Bay in May 2010, will have surgery Monday in New York to repair a torn capsule in his left shoulder.
The San Francisco Giants placed infielder Mark DeRosa on the 15-day disabled list on Thursday because of left wrist inflammation and activated Emmanuel Burriss.
The San Francisco Giants placed Barry Zito on the 15-day disabled list Sunday, a day after the left-hander sprained his right foot attempting to field a bunt.
Wilson strained a muscle in his left side March 17 during a spring game. Wilson led the majors with 48 saves last season for the World Series champions.
The defending world champion will open the season without its star closer. Brian Wilson will be placed on the disabled list with an injured oblique muscle.