Leon Spinks
Leon Spinks is an American former boxer who was the undisputed heavyweight champion of the world. Spinks had an overall record ofwins,losses and three draws as a professional, withof those wins by knockout. In only his eighth professional bout, Spinks won the undisputed world heavyweight championship when he beat Muhammad Ali on February 15, 1978, in what was considered one of the biggest upsets in boxing history. However, he was stripped of the WBC title for fighting Ali in an unapproved rematch seven months later, which he lost by a 15round unanimous decision. Besides being heavyweight champion and his characteristic gaptoothed grin , Spinks gained notoriety for the disaster which befell his career following the loss to Ali.
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Source: Wikipedia