I have to say, on my list a very few come close to Corrales-Castillo I... absolutely insane. As a single fight, it the best brawl. How about best trilogies? I've seen a LOT, but with the overall excitement level, Vazquez-Marquez just beats it's competition. 3 amazing battles getting better and better.
Corrales-Castillo 1 Saad-Johnson 1. That might've been 31 years ago. So maybe Saad-Lopez 2 or Chacon-Limon 4.