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 would say that Roger Federer is pretty amazing. And Manny Pacquiao - he's such a tiny, little lightweight guy, but the way he fights makes people so excited.

I train six days a week for four to five hours a day. I like to keep the same schedule when I'm in camp for every fight.

I'm trying to keep the face of my opponent more or less not damaged but eventually to execute the plan and knock him out.

I don't care where people come from. It is not important to me. If you are good people will like you, if you're not, they won't. It is simple.

There are 49 guys that got bored to sleep on my record, so they got knocked out by it.

I learned in my Ph.D. the discipline I needed to be successful. Most boxers are not that disciplined. They have talent, but the self-organization - the ability to schedule yourself and your priorities - is lacking. My studies were about the control of training on both the psychological and the physical side.