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Right now is Floyd mayweter jr his 41-0
Joe Calzaghe 46 - 0 , the undefeated world super middleweight champion is the longest reigning world title holder in boxing history.
He retired after a professional boxing career spanning almost two decades which saw him unbeaten in 18 years as a professional and amateur boxer.
Joe's record of having won all his 46 professional fights means that he retires as Britain's only ever undefeated world champion in boxing (having held a world title for just two weeks short of eleven years) or indeed any in other major sport.
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