World champion Wladimir Klitschko may suffer from a lack of genuine heavyweight challengers, but he plans to prove his jaw is not made of glass by knocking out France's Jean-Marc Mormeck on Saturday.
World champion Klitschko defends his IBF, IBO, WBO and WBA titles against Mormeck, who stepped up from cruiserweight just over two years ago, in Dusseldorf.
