It is an impossible question, but Hopkins, Pacquiao, and Mayweather all belong in the discussion. Rocky Marciano's conditoning was legendary.
I think fighters in the lowerclasses always get over looked when considering these types of questions. Take someone like Jonnhy Perez. That guy just does not stop.
Alexis Arguello
Had legendary stamina never saw him tired always punching and his power carried with him all 15 rounds proof of this is his knockout of Ruben Olivares.
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