Donald James Larsen (born August 7, 1929) is an American former Major League Baseball (MLB) pitcher. During a 15-year MLB career, he pitched from 1953–1967 for seven different teams. Larsen pitched for the St. Louis Browns / Baltimore Orioles (1953–1954; 1965), New York Yankees (1955–1959), Kansas City Athletics (1960–1961), Chicago White Sox (1961), San Francisco Giants (1962–1964), Houston Colt .45's / Houston Astros (1964–1965), and Chicago Cubs (1967).