BALTIMORE - Daisuke Matsuzaka has begun his shoulder strengthening program, which he hopes will get him back in business by the time he comes off the DL June 14.
The Sox starter seemed to feel guilty that he was on the DL and not contributing.
"Even though I might feel OK, the club has told me to rest up,'' he said. "I do feel bad being the only one getting rest on this team...dwelling on that isn't going to help me heal. I'm going to treat this as a minicamp."