There was no quit in Joe Frazier, Foreman said the only way to stop him was to kill him. Also he wanted to go out for the 15th in Manila despite being blind and behind on the scorecards.
He hasn’t been mentioned but a very solid inclusion is Miguel Angel Gonzalez. The clip below is a sampling of the frightful beating he absorbed from Kostya Tszyu. Gonzalez was a genuine, never say die, fighter. Rd 5 This content is protected
Guys like old timers Ad Wolgast and Oscar “Bat” Nelson. Their willingness to absorb copious amounts of punishment was unreal - and they sadly they paid for it later in life. Joe Grim deserves mention also - I believe they called him the Indian Rubber Man or something similar to.