Follows the life of Roberto Duran, who made his professional debut in 1968 as a 16-year-old and retired in 2002 at age 50. In June 1980, he defeated Sugar Ray Leonard to capture the WBC welterweight title but shocked the boxing world by returning to his corner in the November rematch, saying 'no mas' (no more). Follows the life of Roberto Duran, who made his professional debut in 1968 as a 16-year-old and retired in 2002 at age 50. In June 1980, he defeated Sugar Ray Leonard to capture the WBC welterweight title but shocked the boxing world by returning to his corner in the November rematch, saying 'no mas' (no more). Parental Guide