If its a prime Duran your after, the greatest and most complete incarnation ever to grace the ring, then I suggest his third bout with Dejesus. This showcased Roberto at his absolute peak, it was in my estimations one of the most masterful displays of pugilistic wizardry ever seen.

A tier down would be the first leonard encounter, Palomino, also at Welter.

Lou Bizzaro at lightweight, Buchanan, Kobayashi.

In his later marauding days as a wise old lion, Barkley, Moore, Cuevas.