Thomas Mitchell Herr is an American former professional baseball second baseman. He played 13 seasons in Major League Baseball (MLB) for the St. Louis Cardinals, Minnesota Twins, Philadelphia Phillies, New York Mets, and San Francisco Giants. Although he never won a Gold Glove Award, Herr retired with the highest all-time career fielding percentage for National League second basemen (.989), a figure that was matched and surpassed a few years later when Hall of Famer Ryne Sandberg retired.