Fighters that Changed their Style according to the opponent ?

Azumah Nelson and Marco Antonio Barrera come to mind as fighters that would switch it up when needed. They can both be an all-out aggressive pressure fighter or a patient counter puncher, or they can box off the backfoot if they wanted. Very versatile boxers.

 

For sure. Wasn't a bad idea by Frazier to try to extend the fight a bit and hope for Foreman to tire out. He may have lasted longer if he would have tied Foreman up when necessary. Worked well for Ali vs. Foreman, but that was something Frazier never seemed to do. Even in the first Foreman fight, I don't recall Frazier attempting to clinch even once to buy himself a little time. Same thing when he was in trouble in the 13th & 14th rounds of Ali III. Just wasn't part of his repertoire at all. It may have just delayed the inevitable against Foreman, but it was something he should have tried IMO...

 

Joe Louis against Max Schmeling, the second time. Evander Holyfield vs. Riddick Bowe, the second time. Muhammad Ali (much of the time) vs. most of his second career opponents. George Foreman vs. his second career opponents. Tommy Morrison vs. Old George Foreman. Wladimir Klitschko vs. many opponents later in his career. Lennox Lewis, later in his career. Jerry Quarry, in his first fight vs. Joe Frazier (it didn't work out in the end, but nice try, in hindsight, trying to blast out Joe early).

 

Nelson really embodies this. His fight with Gomez shows this the best. He went from swarming to counterpunching to bouncing around the ring. Then calped it off with one of the most devastating knockouts ever.

 

Although his hands might have had as much to do with it as the opponent, Monzon could be aggressive or box.