It's poorly sourced for it's length, only 16 citations in a article that is about 50 KB in length.
Explain why Ali was stripped of his title in 1964, this is currently mentioned in the list at the end without any reason being given
Add the final decision of the Supreme Court on Ali's refusing to serve in the military. Several court decisions are mentioned but the final conclusion is missing completely!
Properly format all references.
Mention the fact that Ali called Frazier an "Uncle Tom" and "a dumb gorilla," both of which were widely reported in the press at the time.
In the lead-up: "Ali had brought beauty and grace to the most uncompromising of sports and through the wonderful excesses of skill and character, he had become the most famous athlete in the world." Not only is this hyperbolic, but much of it is opinion. Where's the documentation that boxing is "the most uncompromising of sports," or that Ali was without question "the most famous athlete in the world"? "One of the most famous" would be much harder to contest. Also, unless you can find someone with credentials saying that Ali "brought beauty and grace" to boxing (which is a matter of aesthetics, and therefore subjective), the statement should either be qualified or cut outright. Finally, the choice of verb tense is a little strange. Is the past perfect tense necessary here? What's wrong with the simple past (i.e., "Ali brought beauty and grace...")?
The date of the first Frazier-Ali fight was MARCH, not May, 8, 1971. It is correctly reported on the list of fights near the end of the article but stated incorrectly in the earlier text.
