Duran was the Lightweight king in the 70's, he fought 3 epic battles with Esteben De Jesus who in any other era would've been regarded as a great Lightweight Champion. By the time he fought Sugar Ray Leonard he was already 71-1 and that is a huge amount of boxing. It was an amazing performance and probably the last time we ever saw Duran at his peak. Don't judge him for his efforts in the 80's when he is over 30 and past his best. The previous 10 years were devastating.
As much as i like Sweet Pea i just don't think he could've held Duran off for 15 rounds and win a decision, i think Duran grinds him down and wins a late stoppage. Duran TKO 13