Muhammad Ali
February 1964: v Sonny Liston, Miami
Knock-out in round seven to claim the undisputed world title
October 1974: v George Foreman, Zaire
Knock-out in round eight to win the undisputed world title
September 1978: v Leon Spinks, New Orleans
Won WBA title in round 15
Evander Holyfield
October 1990: v James 'Buster' Douglas, Las Vegas
Knock-out in round three for undisputed world title
November 1993: v Riddick Bowe, Las Vegas
Won WBA and IBF titles in round 12
November 1996: v Mike Tyson, Las Vegas
TKO in round 11 to win the WBA title
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