1. Sonny Liston l rtd 6 Cassius Clay

Liston was heavily fancied over loudmouth Clay, but the young upstart went on to shake up the world.

  1. Muhammad Ali w rsf 12 Floyd Patterson

After changing his name, Ali defended his heavyweight crown against former champion and all-time great Patterson.

  1. Joe Frazier w pts 15 Oscar Bonavena

Though his title was fragmented, Frazier was still considered the champ when he saw off dangerous Argentinian Bonavena.

  1. Mike Tyson w rsf 6 Pinklon Thomas

Making the second defence of his WBC title, Tyson decimated once-beaten former champion Thomas to continue his meteoric rise.

  1. Tim Witherspoon l ko 1 James Smith

Witherspoon lost one of his teeth – and his title – when late substitute and former foe “Bonecrusher” Smith ruined him inside a round.

  1. Floyd Patterson w ko 6 Pete Rademacher

In a gross mismatch, Olympic gold medallist Rademacher made his pro debut against heavyweight champion Patterson. He was eventually demolished.

  1. David Haye w rsf 3 Audley Harrison

Although it turned into a farce, there was huge UK interest in this grudge match, which went out on pay-per-view.

  1. Riddick Bowe w ko 2 Jesse Ferguson

Only defending his WBA title, Bowe barely broke a sweat while dispatching Ferguson.

  1. Wladimir Klitschko w rsf 6 Charles Shufford

Shufford had earned his shot with a points win over future champion Lamon Brewster, but was outclassed.

  1. Evander Holyfield w rsf 7 Bert Cooper

After both Mike Tyson and Francesco Damiani pulled out through injury, Cooper was drafted in for Holyfield.