Nikolai Valuev is a former Russian professional boxer. He boxed as a professional heavyweight from 1993 to 2009. Valuev is a former Russian and two-time WBA heavyweight champion. He holds the record as the tallest and heaviest boxing champion in history. At his peak he stood 7' 1" and weighed more than 320lbs. Valuev holds notable wins over John Ruiz, Jameel McCline, Siarhei Liakhovich and Evander Holyfield. He retired at the age of 36, following a majority-decision defeat to David Haye in November 2009.