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Donald John McMahon (January 4, 1930 – July 22, 1987) was an American right-handed relief pitcher in Major League Baseball. Born in Brooklyn, New York, he was signed by the Boston Braves before the 1950 season. He played for the Milwaukee Braves (1957–62), Houston Colt .45s (1962–63), Cleveland Indians (1964–66), Boston Red Sox (1966–67), Chicago White Sox (1967–68), Detroit Tigers (1968–69), and San Francisco Giants (1969–74).
McMahon was used almost exclusively in relief during his 18-year major league career. He appeared in 874 games, just two as a starter, and was one of the busiest and most dependable relievers of his era. He never was on the disabled list, and in the fifteen full seasons that he played (1958–72), he averaged about 54 games and 81 innings pitched per year.