This is a good thread:

The Tyson that fought Spinks - an electrifying a performer as ever stepped into a boxing ring.

The Ali that fought Cleveland Williams - absolute grace under pressure and a devastating display.

The Louis that fought Schemeling - I'm not sure any fighter in history could have lived with Louis that night.

The Marciano that fought Walcott (first time) - you could have hit the Rock with the kitchen sink that night and he was going to walk right through it.

The Liston that fought Wayne Bethea - a monstrous performance

The Foreman that fought Frazier - power, power, power, power and size.