Nikolai Sergeyevich Valuev (born 21 August 1973) is a Russian former professional boxer and two-time WBA heavyweight champion. After a professional career spanning 16 years, Valuev officially retired from the sport in November 2009. His final fight was a WBA heavyweight title defense against David Haye, in which Valuev was defeated by majority decision after twelve rounds. Valuev defeated three world champions in John Ruiz, Siarhei Liakhovich and Evander Holyfield, as well as top contenders such as Clifford Etienne, Larry Donald, Owen Beck, Monte Barrett and Jameel McCline. He currently resides in his birthplace of St. Petersburg with his wife and two children.