One of the reasons I have always had great admiration for Rocky Marciano was that he knew when to hang it up; and despite lots of money thrown his way never came back. you look at the heavyweight ranks and he is the only one that ever did it right.
Even in the lighter weights you are hard put to find more than a handful that did it the right way.
In football and baseball and basketball the number of players that knew when to hang it up and stuck with that are very few.
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