Athlete who boasted "I'm young; I'm handsome; I'm fast; I'm pretty and can't possibly be beat" (3)

I believe the answer is:

ali

(Other definitions for ali that I've seen before include "Muhammad --, US boxer" , "Person" , "A champ'" , ""The Greatest" boxer" , "Dickens novel" .)

I've seen this clue in The New York Times.

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