Free agent slugger J.D. Martinez has told the Red Sox he would DH and play the outfield for them, a baseball source said Friday. The flipside: teams are offering Martinez a full-time outfield job, and he enjoys playing the outfield. Martinez, the best bat available via free agency, visited with teams at the winter meetings this week. Michael Silverman of the Herald wrote Friday that Martinez has been telling teams he prefers to play the outfield, and suggested the Sox will have to pay a bit more to land Martinez. “Martinez remains open to being a DH so his preference to play defense regularly does not eliminate the Red Sox from signing Martinez,” Silverman wrote. “It does, however, put them in a position of having to make an aggressive offer that would distance themselves from competing offers where teams can present a corner outfield position.