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Cole Kimball throws pen session
Cole Kimball - R - Washington Nationals
March 21, 2013 - 7:35 PM ET

Cole Kimball (shoulder) threw a successful bullpen session Wednesday.

Kimball has been out of action for a week due to stiffness in the back of his shoulder. Though it's not considered serious, he has a history of shoulder issues and missed most of the last two seasons because of rotator cuff surgery. He'll begin the year at Triple-A.