Leonard later relinquished the title after retiring from boxing because of a detached retina .
Sugar Ray Leonard unified his WBC with Thomas Hearns 's WBA to become the first undisputed champ in seven years .
Sugar Ray Leonard later relinquished the title after retiring from boxing because of a detached retina .
Sugar Ray Leonard unified his WBC with Thomas Hearns 's WBA to become the first undisputed champ in seven years .