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)
U.S. boxing great Muhammad Ali poses during the Crystal Award ceremony at the World Economic Forum (WEF) in Davos, Switzerland January 28, 2006. REUTERS/Andreas Meier/File Photo