The Red Sox released the outfielder, who hit just .188 with a .255 OBP in 92 plate appearances for Pawtucket, after less than a month with the team, according to the Providence Journal. Duncan was acquired from the Cardinals in a deal that sent shortstop Julio Lugo to St. Louis.
Duncan really did not have a place on the Red Sox, and he isn't a solid enough situational hitter to make the bench. In 79 career pinch hitting at-bats, Duncan is a .241 hitter with 6 home runs and 27 strike outs. He'll likely have to sign a minor league deal to work his way back to a major-league roster.