Many people forget about his lightweight days he was out of his prime in the 1980's.He was unstoppable at lightweight.Extremely high work rate tremendous power.I dont see anyone coming close to beating him at lightweight maybe aaryon pryor.He beat sugar in his prime if you watch the first fight sugar gave his all and it was a close fight.He beat benetiz?beat hearns?and runs all night like a girl agaisnt hagler,throwing a flury of punches in the last 10 seconds of every fight.Duran at the time was getting old and he had trouble getting up for certain fights for example he knocks out barkeley at 37 years old wins the fight,barkeley knocked out hearns.He was best at lightweight and should not have gone higher then welterweight those that was his natural weight.