Floyd Patterson
Sonny Liston
Henry Cooper
Archie Moore
Cleveland Williams
Joe Frazier
George Foreman
Bob Foster
Mac Foster
Doug Jones
Ken Norton
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George Foreman and Leon Spinks. He also beat Sonny Liston but he was known as Cassius Clay at that time. Also, he did not REGAIN the title at that time; that was his first pro world heavyweight championship.