If you want a player to serve and volley more, you need to teach them to do that more, how to move at the net.

I've been asked a lot lately if tennis is clean or not. I don't know any more how you judge whether a sport is clean. If one in 100 players is doping, in my eyes that isn't a clean sport.

I felt my left hamstring pull and after that I couldn't really move to my backhand well,

I don't normally let leads like that slip away. I had chances. He is obviously a very good player and has a lot of experience.

I used to think that losing made you more hungry and determined but after my success at the Olympics and the U.S. Open I realise that winning is the biggest motivation.

We teach about how to drive in school, but not how to manage finances.