The Boston Red Sox and Texas Rangers have agreed in principle to a trade involving Eric Gagne, and the Red Sox are now negotiating with the former Cy Young winner to get him to accept the trade. The Rangers are set to receive prospects Kasan Gabbard and outfielders David Murphy and Engel Beltre in the deal. Boston is not on Gagne's approved list of 12 teams he can be traded to. After missing much of the past two years with injuries, Gagne has returned to form this season with a 16 saves in 17 chances and a 2.16 ERA.