I'm quite shocked by the recent British media stories about an alleged brawl between myself and Dereck Chisora. I am a professional prize fighter and let my fists do the talking only inside the ring. I don't want to comment on Chisora's psychological issues.

I always train and prepare with highest concentration and focus on my next opponent. To me, it does not matter what his name is.

I think a fight with David Haye, even if he is not American, is going to give positive vibes about the heavyweight division for the American fans and fans worldwide.

I Was Psychologically Sick For 3 Days Afterwards.

In the old days, when Muhammad Ali was fighting Ken Norton, Joe Frazier and George Foreman, there was a lot of excitement in the heavyweight division, I have to admit it.

On your way to the top, you always get some chriticism. Criticism is a great motivation.

Mental strength is really important because you either win or lose in your mind.