Muhammad Ali Clay is former American professional boxer; his
real name is Cassius Marcellus Clay. He was born on January 17th
1942. Clay made his professional debut on October 29, 1960. Muhammad won the
world heavyweight championship in 1967.His nickname was the greatest during his
prime because of his historical matches. Clay formally retired on December 11,
1981 after his last match with Trevor Berbick at the age of 39.
