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.

Tennis is an individual sport, and I am quite a self-conscious person.

He is a good guy and he works very hard. He wants to be a tennis player and I think he has shown he has the talent.

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 often find that pundits are quite negative... not just in tennis, but in sport in general. I just don't like that. Obviously, the job of a pundit is to create interest and a bit of controversy. I get that. Listeners like that. But I do think there's a duty there to promote the sport and talk about how good these people are at what they do.

Earlier in my career, I used to spend a lot of time practising my tennis on court. Now I've learned that it's better to do just a couple of hours on court and two gym sessions a day. That's what's made me fitter and stronger.