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Roberto Duran was one of the fearsome brawlers in boxing history but his achievements are often eclipsed by two little words - ``no mas''.
The Panamanian superstar created an indelible stain on his legacy the night in November 1980 he walked away mid-rematch with his great rival Sugar Ray Leonard.
Duran had won a stunning 15-round points decision over Leonard for the WBC welterweight title earlier the year. But when Leonard employed new frustrating tactics, `Hands of Stone' had had enough.
In the eighth round he suddenly turned away from the battle and muttered those two famous words will be etched upon his memory in spite of all his other, animal-like success.
Duran had broken arguably the greatest unwritten rule in boxing - real fighters just do not quit.