Ali, Muhammad (1942- ), American boxer, who in 1978 became the first boxer to win the world heavyweight championship title three different times. Originally named Cassius Marcellus Clay, Jr., he was born in Louisville, Kentucky. After winning the light heavyweight title at the 1960 Olympic Games, he turned professional, and in 1964 he made good his claim of being "The Greatest"; after only 20 professional fights he upset Sonny Liston and became world heavyweight champion. In the same year, after joining the Black Muslims, he assumed the name Muhammad Ali. In 1967 he refused to be inducted into the United States Army on the grounds that he was a Black Muslim minister and therefore a conscientious objector. He was subsequently convicted of draft evasion, and the ruling bodies of boxing declared his title vacant. Ali returned to the ring in 1970 and won two fights, but he lost a championship bout to Joe Frazier in March 1971. Later that year the U.S. Supreme Court overturned Ali's conviction.

Ali made a comeback in 1974 by defeating Frazier in January, and he regained the heavyweight title by knocking out the champion, George Foreman, in October in Kinshasa, Zaire. Four years later, in February 1978, he lost the title to Leon Spinks in Las Vegas, Nevada. Within the same year, however, he regained the title, beating Spinks in a 15-round bout in New Orleans, Louisiana, in September. He retired in 1979 but came out of retirement the following year to challenge Larry Holmes for the World Boxing Council heavyweight championship. Ali lost the match to the defender.
Throughout his career, Ali earned a reputation as an aggressive fighter with a colorful personality. His skills supported his claim that he could "float like a butterfly, sting like a bee." Outside the ring, Ali savored the media limelight, challenging and taunting prospective opponents through interviews and prearranged confrontations. He became one of the most recognizable sports figures in the world and retired as one of boxing's greatest champions.

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