When you talk about Roberto Duran's skills, you obviously have to mention his power. Nothing you can work on... just God-given power. And he was deceptively quick. He may not have had the smoothest boxing style ever (such as a SRL), but he had great head movement, which resulted in good defense. And the power was with BOTH hands. I mean, they were just HEAVY (hence, the nickname "Hands of Stone"). Finally, his ferociousness. The guy just worked himself into a frenzy and wanted to rip your head off in there. You rarely, if ever, saw any hugging after a fight with "Mano de Piedra" Duran.