Darnell Lamont Boone (born January 21, 1980) is an American professional boxer. Despite having never challenged for a world title, Boone is notable for facing several future world champions over the course of his career, from middleweight to light heavyweight. In 2004, he was the first to score a knockdown against undefeated Olympic gold medalist Andre Ward, who went on to win a unanimous decision over Boone. In 2010, Boone caused a major upset when he knocked out future world champion Adonis Stevenson, who later gained revenge by knocking out Boone in 2013. Boone also defeated Willie Monroe Jr. in 2011, who later challenged twice for a world title. Other world champions Boone has faced include Jean Pascal, Erislandy Lara, and Sergey Kovalev (twice).