Nikolai Valuev is a former Russian professional boxer. Valuev is a former two-time WBA world heavyweight boxing champion, and the current record holder as the largest boxer ever to win a world title. Valuev's world title fight records stands at 8 wins and 2 losses. He holds notable wins over John Ruiz and Evander Holyfield. Valuev officially retired from boxing at the age of 36, following a unanimous decision loss to David Haye in November 2009.