JD Martinez's slump indicates he made a mistake not opting out of Red Sox contract last year
J.D. Martinez Contract Includes Medical Protection For Red Sox
MLB Rumors: Red Sox Interested in J.D. Martinez After Not
J.D. Martinez and other big hitters pulling for the return of
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J.D. Martinez leaves Red Sox, reportedly agrees to one year, $10
JD Martinez does not opt-out of contract, will remain with Red Sox