Already known to have Todd Frazier, Martin Prado, Jed Lowrie and Yangervis Solarte on their radar, the Red Sox are also scouting two Pirates (Josh Harrison and David Freese), a pair of Mets (T.J. Rivera and Asdrubal Cabrera) and the Giants’ Eduardo Nunez as they search for a third baseman, according to Michael Silverman of the Boston Herald.