Cassius Clay

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US American boxer Muhammad Ali (former Cassius Clay) playfully places a punch at Joe Louis's belly in a hotel in Frankfurt am Main, West Germany, September 3, 1966. (AP Photo)

Banner headlines proclaiming his feat occupied the attention of heavyweight champion Muhammad Ali ?Cassius Clay? at his motel at nearby Auburn. Clay successfully retained crown via a one-round KO over Sonny Liston in Lewiston, Me., on May 26, 1965. (AP Photo)

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Banner headlines proclaiming his feat occupied the attention of heavyweight champion Muhammad Ali ?Cassius Clay? at his motel at nearby Auburn. Clay successfully retained crown via a one-round KO over Sonny Liston in Lewiston, Me., on May 26, 1965. (AP Photo)

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Heavyweight champion Muhammad Ali ?Cassius Clay? (left) loses smile and raises hand briefly during exchange with Sonny Liston after weight-in ceremony at Lewiston, Me., arena on May 25, 1965. The exchange never went beyond words and the action will be a 15-round title bout. In center is Drew Brown, an Ali trainer. Clay weighed 206 and Liston 215 ¼. (AP Photo)

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Heavyweight champion Muhammad Ali (Cassius Clay) , arms upraised, begins his victory dance around challenger Sonny Liston on May 25, 1965 after he cut short their scheduled 15-round title bout by knocking him out in one minute of the first round. Referee Joe Walcott waves his arm ending the bout. (AP Photo)

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Heavyweight champion Cassius Clay is seen after having successfully defended his crown with a one-minute knockout of challenger Sonny Liston, May 25, 1965 in Lewiston, Me. It was his first defense of his title. (AP Photo)

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Heavyweight boxing champion Muhammad Ali (Cassius Clay) covered his yawn as he faced newsmen after arrival at his motel in Auburn nearby in Lewiston, Me. on May 24 1965. He and his entourage had driven up from his Chicopee Falls, Mass. training camp. He puts his title on the line against Sonny Liston. (AP Photo)

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Heavyweight champion Muhammad Ali (Cassius Clay) formally requested on June 23, 1965 an annulment of his 10-month-old marriage to former model, Sonji Ray. Clay initiated the action because, he claims, his wife had not been a good ?Muslim.? They are shown leaving an Auburn, Md., inn on May 23, two days before Clay?s victorious title bout with Sonny Liston in Lewiston, Me. (AP Photo)

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National Edition News cover for February 25, 2014 - WAS ALI-LISTON FIXED? Sonny Liston, right, ducks low and weaves to escape a punch from Cassius Clay's cocked right fist during the 5th round of the heavyweight title fight in Miami Beach, Florida, February 25, 1964. Clay won on a seventh round technical knockout. (AP Photo/stf)

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Sonny Liston, right, ducks low and weaves to escape a punch from Cassius Clay's cocked right fist during the 5th round of the heavyweight title fight in Miami Beach, Florida, February 25, 1964. Clay won on a seventh round technical knockout. (AP Photo/stf)

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This is how champion Sonny Liston and challenger Cassius Clay measure up for their world heavyweight title bout at Miami Beach, February 25, 1964. (AP Photo)

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Sugar Ray Robinson, left, and Cassius Clay, right, gesture like champs on the way to the dressing room after Clay's technical knockout victory in the seventh round over heavyweight champion Sonny Liston in Miami Beach, Florida, February 25, 1964. In the center, an emotional Clay handler, Drew "Bundini" Brown, escorts the new champ. (AP Photo)

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Muhammad Ali, or Cassius Clay, right, as he was known at the time, is shown in action against Sonny Liston during the heavyweight title fight in Miami Beach, Fla., Feb. 25, 1964.The bout lasted only one minute into the first round. (AP Photo)

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Sonny Liston, left, shown during the heavyweight title fight against Muhammad Ali, or Cassius Clay, as he was known at the time, in Miami Beach, Fla., Feb. 25, 1964.The bout lasted only one minute into the first round. (AP Photo)

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Muhammad Ali, or Cassius Clay at the time, strikes a familiar pose as he shouts "I am the greatest," as he leaves the ring, arms raised, following his defeat of former heavyweight boxing champion Sonny Liston in Miami Beach, Fla., February 25, 1964. (AP Photo)

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Cassius Clay's handlers hold him back as he reacts after he is announced the new heavyweight champion of the world on a seventh round technical knockout against Sonny Liston at Convention Hall in Miami Beach, Fla., on Feb. 25, 1964. (AP Photo)

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Challenger Cassius Clay, right, gets out of the way of a long left jab thrown by heavyweight champion Sonny Liston during title fight in Miami Beach, Fla., on Feb. 25, 1964. Clay, 22-year-old from Louisville, won the title crown with a TKO in the 7th round. (AP Photo)

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Cassius Clay makes like a loudmouth after being declared heavyweight champion of the world at Miami Beach, Florida, February 25, 1964. Clay beat champion Sonny Liston after six rounds in one of the greatest upsets in fight history. (AP Photo/stf)