The greatest stamina ever?? Marciano gets my vote.

[leff]

Marciano`s the man

[Hurlex]

then:
1-marciano
2-hagler
3-salvador sanchez

now:
1-hopkins
2-morales
3-mab/winky

[Duncan]

then:
1-marciano
2-hagler
3-salvador sanchez

now:
1-hopkins
2-morales
3-mab/winky

Nothing wrong with that list, as far as I can see.

[dempseyfire]

Joe Frazier has to be mentioned. Incredible stamina . .
Ray Robinson also had remarkable staying power and late-fight punching power . . .