Shelley Duncan, American baseball player and manager
David Shelley Duncan (born September 29, 1979) is an American former professional baseball player. He was a left fielder, designated hitter, and first baseman. Duncan played in Major League Baseball (MLB) for the New York Yankees, Cleveland Indians, and Tampa Bay Rays. He was the Major League field coordinator for the Toronto Blue Jays. He is currently the analytics coordinator for the Chicago White Sox.