HAMBURG, GERMANY - WBO/IBO/WBA/IBF heavyweight champion Wladimir Klitschko (L) of Ukraine and mandatory challenger Kubrat Pulev of Bulgaria pose head to head after their kickoff press conference ahead of the upcoming heavyweight title fight at O2 World on September 6th. Klitschko has been knocking off the competition with little to no trouble. Pulev, undefeated and hungry, has beaten several veteran fighters to earn his position at the world crown.