シーズン本塁打記録の変遷

1879 Charley Jones - 9
1883 Harry Stovey - 14
1884 Ned Williamson - 27
1919 Babe Ruth - 29
1920 Babe Ruth - 54
1921 Babe Ruth - 59
1927 Babe Ruth - 60
1961 Roger Maris - 61
1998 Mark McGwire - 70
2001 Barry Bonds - 73