Shannon Briggs is an American professional boxer. A veteran of the sport since 1992, he has held a world heavyweight championship twice, including the lineal title from 1997 to 1998, and the WBO title from 2006 to 2007. Briggs is known for his formidable punching power, possessing an 88.3% knockout-to-win ratio, with 37 knockout wins in the first round. Undisputed heavyweight champion Lennox Lewis stated in 2015 that Briggs had the fastest hands and best punching power of any opponent he ever faced. He holds notable wins over heavyweight champions; George Foreman, Ray Mercer and Siarhei Liakhovich.