The Red Sox are doing due diligence on free agent Rocco Baldelli, who could be in the mix as a fourth outfielder after the team dealt Coco Crisp to the Kansas City Royals last week for reliever Ramon Ram?rez. According to major league sources, Baldelli, from Cumberland, R.I., met with the Red Sox at Fenway late last week to discuss his future and the effects of the mitochondrial disorder that limited him to 80 at-bats with the Rays last season.