Charles L. "Sonny" Liston (unknown – December 30, 1970) was an American professional boxer known for his toughness, punching power and intimidating appearance. A long-avoided contender, he became world heavyweight champion in 1962 by knocking out Floyd Patterson in the first round, repeating the knockout in a defense of the title. Although widely regarded as unbeatable, Liston lost the title in 1964 to 7–1 underdog Muhammad Ali.