The fight between Floyd "Pretty boy" Mayweather and Ricky "The Hitman" Hatton on December 8 lasted ten rounds before Hatton was dramatically knocked out.
Both fighters were undefeated – hence the title of the event – until Saturday's head-to-head.
Hatton said afterwards that his opponent was a lot cleverer than he had given him credit for, and a big gap in points by the knock-out round backs this up.
However, the American praised Hatton, who he described as the "toughest competitor" he had ever fought.
And it was far from a one-sided fight; although Mayweather levelled the first meaningful punch in the first round, the crowd gasped moments later when a Hatton hit sent the pretty boy stumbling backwards.
Celebrity spectators included David Beckham, Brad and Angelina and Kid Rock, and the MGM Grand buzzed with the sound of the 17,000-strong crowd throughout the much-anticipated fight.
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