The former world heavyweight champion David Haye knocked fellow Briton Dereck Chisora to the canvas twice in the fifth round to win their grudge match in London last night.
The pair were involved in an ugly brawl at a news conference in Munich last February following Chisora's defeat by WBC heavyweight champion Vitali Klitschko.
Haye had flown to Germany in pursuit of a bout with Klitschko after losing to his brother Vladimir last year and subsequently announcing his retirement.
Last night's fight at the home of English Premier League soccer club West Ham United for the WBO and WBA international heavyweight titles had been sanctioned by the Luxembourg Boxing Federation.
The British Boxing Board of Control would not sanction the fight because neither boxer held a British licence.