We're not talking about Frazier or Marciano we're talking about Tyson a guy who DID give up, a guy who DID get frustrated in the ring. I don't hate on Tyson but it must be said that for as intimidating as he was he was a psychologically weak fighter. Frazier and Rocky are 2 of the mentally toughest fighters there have ever been, Tyson didn't have that in him. Tyson never got up to beat someone, he never scored a KO when he was down on points, and when the momentum of a fight was taken from him he caved. Hell of a fighter, but that flaw of being psychologically weak is a big flaw.