I read somewhere that real reason Marciano retired was because of all the trauma to his face/nose/head and the fact that he suffered from severe back pains in his last few fights. I also heard that he didn't want to continue giving a big chunk of his purses to his manager Al Weill, reported to be as much as 50%.
Marciano was a great champion, who defeated everyone they put in front of him, most by KO. When all is said and done, whether or not Rocky would have been able to hang with bigger, stronger, Heavyweights, like Liston, Ali, Holmes, or Tyson, remains to be seen, and really makes little difference.
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