In what is easily the toughest test since his fight against former WBA champ David Haye in 2011, IBF/IBO/WBA/WBO heavyweight champion Wladimir Klitschko (62-3, 52 KOs) will be putting his belts on the line against #1 IBF Kubrat Pulev (20-0, 11 KOs) next month on September 6th at the O2 World Arena, Altona, in Hamburg, Germany.
