Corrales-Castillo-I was awesome, especially Round 10.
Leonard-Duran-I was a classic.
Hagler-Hearns was condensed mayhem for 3 rounds.
There's so much to pick from....

But my personal favorite (and most exciting from a personal perspective), was Trinidad-Vargas.

All these fights, except Hagler-Hearns, had "ebb and flow". They were back and forth, with numerous changes in momentum. That's something I like to see in exciting, classic fights.