What boxers had/have legendary endurance/stamina?

Drago. They are man, I am machine.

Joe Frazier. Carlos Monzon.

Sugar Ray Robinson

It's a lot easier to have "legendary stamina" when you're so economical with your output. Also, when you don't punch hard. Considering how hard Tyson punched, I'd say he has very good stamina.

I was just watching a documentary on Marciano where numerous ATG and HOF fighters said that his stamina was one of the reasons he was so successfull. What fighters in your mind have the stamina that is unmatched by many of the fellow prize fighters: my top. 5 are ( 2-5 no particular order) 1- rocky Marciano 2- Floyd Mayweather 3- Manny Pacquiao 4- Antonio Margarito 5- Marvin Hagler Roberto Duran , Salvador Sanchez had better stamina than any of these guys. I recall watching Sanchez fight the first round or the 15th round as if they were the same. These guys did this without steroids or Ariza shakes. As you can see from your list number 2 and 3 both have ties to HGH and steroids

It's a lot easier to have "legendary stamina" when you're so economical with your output.

Manny Pacquiao Sugar Ray Leonard Julio Cesar Chavez

Carl Froch

Canelo......:smashfrea

Ones who went 15 rounds.

Paul Williams.