Daisuke Matsuzaka, who hasn't pitched since May 16, will undergo Tommy John surgery, according to Mamoru Shikama of Nikkan Sports.
Mamoru Shikama of nikkan sports reporting matsuzaka needs Tommy John surgeryless than a minute ago via Echofon 
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karl ravech
karlravechespn
Matsuzaka's injury was not originally expected to require immediate surgery, although all signs point towards Tommy John surgery in the future for the Red Sox' Japanese starter.
On May 17, Matsuzaka was placed on the 15-day Disabled List with right elbow soreness. Matsuzaka will reportedly inform Red Sox management of his decision on Thursday morning, according to Gordon Edes.
Daisuke Matsuzaka has elected to have Tommy John surgery, is expected to infom Sox of his decision tomrrow a,m, according to baseball sourceless than a minute ago via TweetDeck Favorite Retweet Reply
Gordon Edes
GordonEdes
Matsuzaka is 3-3 with a 5.30 ERA, 26 strikeouts and 23 walks this season for Boston.