The Red Sox plan to investigate potential deals for Manny Ramirez between now and the July 31 trade deadline, sources said Saturday night. The Mets New York Mets already have checked in on Ramirez, with whom GM Omar Minaya is infatuated. However, sources said the Mets' No. 1 nemesis, the Phillies, have the best chance to trade for Ramirez because Philadelphia manager Charlie Manuel has perhaps the strongest relationship with him of anyone in the majors. The Red Sox are more likely to retain Ramirez and then not pick up his $20 million 2009 option. Arizona is known to have some interest, as well, but officials from other teams say the Diamondbacks seem more committed to pursuing the potentially available Braves first baseman Mark Teixeira than anyone else.