<p>Muhammad Ali was not an undefeated fighter and he does not have any world records like many others on our list. So why do so many experts consider him to be one of the greatest? </p>

Muhammad Ali was not an undefeated fighter and he does not have any world records like many others on our list. So why do so many experts consider him to be one of the greatest?

<p>Muhammad Ali was not an undefeated fighter and he does not have any world records like many others on our list. So why do so many experts consider him to be one of the greatest?&nbsp;</p>

Greatest Athletes of All-Time: Muhammad Ali

Listen to the stories behind the professional athlete and how they became the person we know and love.

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Greatest Athletes of All-Time: Muhammad Ali

Greatest Athletes of All-Time: Muhammad Ali