On this day in 1964, 22-year-old Cassius Clay shocks the odds-makers by dethroning world heavyweight boxing champ Sonny Liston in a seventh-round technical knockout. The dreaded Liston, who had twice demolished former champ Floyd Patterson in one round, was an 8-to-1 favorite. However, Clay predicted victory, boasting that he would "float like a butterfly, sting like a bee" and knock out Liston in the eighth round. The fleet-footed and loquacious youngster needed less time to make good on his claim--Liston, complaining of an injured shoulder, failed to answer the seventh-round bell. A few moments later, a new heavyweight champion was proclaimed. Cassius Marcellus Clay Jr. was born in Louisville, Kentucky, in 1942. Clay went undefeated in his first 19 bouts, earning him the right to challenge Sonny Liston, who had defeated Floyd Patterson in 1962 to win the heavyweight title. On February 25, 1964, a crowd of 8,300 spectators gathered at the Convention Hall arena in Miami Beach to see if Cassius Clay could put his money where his mouth was. He danced and backpedaled away from Liston's powerful swings while delivering quick and punishing jabs to Liston's head. Liston hurt his shoulder in the first round, injuring some muscles as he swung for and missed his elusive target. By the time he decided to discontinue the bout between the sixth and seventh rounds, he and Clay were about equal in points. A few conjectured that Liston faked the injury and threw the fight, but there was no real evidence, such as a significant change in bidding odds just before the bout, to support this claim. To celebrate winning the world heavyweight title, Clay went to a private party at a Miami hotel that was attended by his friend Malcolm X, an outspoken leader of the African American Muslim group known as the Nation of Islam. He joined and later took the Muslim name of Muhammad Ali. Muhammad Ali would go on to become one of the 20th century's greatest sporting figures.