Rocky Marciano History: April 27, 1967 - Rocky Marciano retires as undefeated boxing champ April 27, 1956 - Heavyweight champ, Rocky Marciano, retires undefeated from boxing September 21, 1955 - Rocky Marciano KOs Archie Moore in 9 for heavyweight boxing title May 16, 1955 - Heavyweight Rocky Marciano KOs Don Cockell in San Francisco May 16, 1955 - Rocky Marciano TKOs Don Cockell in 9 for heavyweight boxing title September 17, 1954 - Rocky Marciano KOs Ezzard Charles in 8 for heavyweight boxing title June 17, 1954 - Rocky Marciano beats Ezzard Charles in 15 for heavyweight boxing title September 24, 1953 - Rocky Marciano TKOs Roland LaStarza in 11 for heavyweight boxing title May 15, 1953 - Heavyweight Rocky Marciano KOs Joe Walcott in Chicago May 15, 1953 - Rocky Marciano KOs Jersey Joe Walcott in 1 for heavywgt boxing title September 23, 1952 - Rocky Marciano KOs Jersey Joe Walcott in 13 for hw boxing title February 13, 1952 - Rocky Marciano defeated Lee Savold for his 39th straight win October 26, 1951 - Rocky Marciano defeats Joe Louis at Madison Square Garden September 1, 1923 - Rocky Marciano, heavyweight champion boxer, 1952 - 1956