Best Performance you ever saw in a boxing ring?

Morales vs Maidana always comes to mind. Seeing that old warrior answer the bell, way above his weight , way past his prime, against a legit opponent....just awesome

 

Jorge Kahwagis tko against Ramon Olivas hand down

 

Nicollino Locche taking the title from Takeshi Fuji without taking so much as a scratch is up there.
Napoles - Cokes II
Duran - Leonard I of course

 

Duran against DeJesus 3.

Frazier against Ali in Superfight 1.

Aaron Pryor against Alexis Arguello 1.

Floyd Mayweather against Chico Corrales.

Those come to mind

Let me add Hopkins against Tito Trinidad.

 

Probably
Duran vs SRL I- 2 ATG’s both in their primes. I am not even a Duran fan, but if this is not number 1 it’s gotta be in the conversation