ST. PETERSBURG -- Red Sox reliever Joel Hanrahan underwent surgery on Thursday to repair his flexor tendon and also had Tommy John surgery.
Bone spurs were also removed.
The surgery was performed by Dr. James Andrews in Pensacola, Fla. Hanrahan won't pitch again in 2013 and could miss part of the '14 season.
He is a free agent at the end of this season. The right-hander had a frustrating first season with the Red Sox, posting a 9.82 ERA in nine games.