4. Robert Helenius 19-0-0
The Nordic Nightmare is another big man yet to be defeated, but unlike the previous fighters Helenius has won belts to prove his worth, including the EBU heavyweight title and inter-continental heavyweight titles (WBA and WBO). Helenius's undefeated streak came under fire when he won a controversial decision over Derick Chisora. However his record does boast some exceptional fighters such as wins over Samuel Peter, Lamon Brewster and Michael Sprott. At twenty nine Helenius will be looking to further his career and get a shot at a Klitschko, however with his big size the Klitschko's might be put off.