The fact that Rocky Marciano isn't on that list makes ESPN's list a sham.
Sports Illustrated in their "Most Overrated and Most Underrated" issue pinpointed Muhammad Ali as the most overrated and Rocky Marciano as the most underrated.
Ali didn't knock that many people out and Marciano did. I mean honestly(49-0with 43 KO's?)
Plus he was UNDEFEATED and he knocked out Joe Louis(old or not; Louis DID make a very competent resurgence)
Ali IN HIS PRIME was formidable no doubt; but with two entirely different styles; who here with half a brain in their head thinks Marciano would have fallen for the "rope-a-dope"?