Nikolai Valuev 7 November 2009, billed as "'David vs. Goliath"', Valuev faced off against former unified and lineal cruiserweight champion David Haye (22-1, 21 KOs) at the Arena Nürnberger Versicherung in Nuremberg. Valuev lost on points (114–114, 116–112, 116–112). Valuev announced his retirement from boxing in a Russian newspaper three days after the loss to Haye on 10 November 2009. In 2010, Valuev's doctor went on record saying that he is treating Valuev for "serious bone and joint problems". Valuev underwent two operations that required at least six months on the sidelines. Valuev confirmed in 2013 that medical advice was one of
Heavyweight boxing championship records and statistics United Kingdom tied USA for most wins in WBO Heavyweight title fights with 8. WBO struggled with receiving credibility at first, but by the beginning of the 2000s, the WBA was giving the same recognition to WBO champions as it did to WBC and IBF champions. WBO, WBC, IBF and WBA are all recognized as major boxing organizations by each other and the International Boxing Hall of Fame. Riddick Bowe remains the only heavyweight boxer to win all four world titles (WBA, WBC and IBF in 1992–93 and WBO in 1995), while Vitali and Wladimir Klitschko are the only brothers