The US player Andy Roddick reaches speeds of 220 kilometers per hour when he serves. If I train with him every day, I will later be at an advantage against a player whose service crosses the net at 190 kilometers per hour.

I am a guy who likes to do what I am doing with passion, whether it's a soccer match with friends or golf.

I think is about confidence. Is about doing the right things. Is about being healthy. Is not about if I want to work or if I don't want to work. Is about if I can work or if I can't work.

Something that works for one person could be a disadvantage to another.

I doubt about myself. I think doubts are good in life. The people who don't have doubts I think only two things-arrogance or not intelligence.

Always I believe that I can play better. But I am happy.

I have always tried to avoid regrets. Could I have done differently some things in my career? Maybe.