Answer: muhammadali

AnswerCrossword Clue
MUHAMMADALI

Megalomaniacal Athlete

MUHAMMADALI

'60s and '70s heavyweight champ

MUHAMMADALI

Sports Illustrated's Sportsman of the 20th Century

MUHAMMADALI
Sports Illustrated's Sportsman of the Century
MUHAMMADALI
Cassius Clay
MUHAMMADALISparking
MUHAMMADALISelf-proclaimed "astronaut of boxing"
MUHAMMADALI"It's hard to be humble when you're as great as I am" speaker
MUHAMMADALIWho said "My only fault is that I don't realize how great I really am"
MUHAMMADALISubject of the tome "GOAT"