Roberto Duran was a boxer who entered the world of boxing in 1968 at the very young age of 16. He retired from this career at age 50 in 2002. He goes through all sorts of exciting events and ordeals during the course of his boxing career, including defeating Sugar Ray Leonard in 1980 and becoming the winner of the WBC welterweight title. However, he surprised all of his fans and onlookers when he went back to his corner during the rematch that took place in November. He very notably said 'no mas,' which in English meant "no more."