The 30-year-old right-hander was 49-30 in 105 starts for Boston since coming over from Japan for more than $100 million (with half of that money going to his former team just for the right to speak with him).
After a terrific rookie year and an even better sophomore season, Matsuzaka has fallen apart. He owns a career 4.25 ERA and 1.40 WHIP. This season he was 3-3 with a 5.30 ERA before being shut down on May 18 with a right elbow sprain.
The Red Sox may finally be able to wash their hands of one of the worst investments in franchise history, but they still need someone to take the ball every fifth day. Here's a look at the 10-best candidates to fill Matsuzaka's spot in the rotation.