Shannon Briggs is an American boxer who competes in the heavyweight division. Briggs turned professional in 1992 as a heavyweight. Briggs is the former 2-time world heavyweight champion. He defeated George Foreman for the Lineal heavyweight title in 1997 and also became the WBO heavyweight champion in 2006 with a twelfth round knockout win over Siarhei Liakhovich, before losing it in his first defence to Sultan Ibragimov via 12-round unanimous decision in 2007. Briggs is known for being a hard puncher and holds a world record of most 1st round wins by knockout in the history of heavyweight division.