Sugar Ray Leonard had no doubt that he’d defeat Roberto Duran when the two warriors squared off in a rematch of their epic first welterweight title bout that ended in a split-decision victory for the Panamanian known as “The Hands of Stone.” What Leonard, the legendary six-time world champion, didn’t know was that Duran – one of the most feared fighters of his generation – would surrender after uttering the most infamous phrase in the history of boxing, “No Mas.”