It's a tough world out there and all the guys are fighting hard and the competition is really tough.

I retired because I had a knee injury, my cartilage was wearing out, it was painful and I couldn't put in the four hours of practice each day that I needed to.

But whatever happens, when you leave London you feel like a winner because it's a great venue and it's so nice to be there with all the guys.

Anything is possible as long as you have the passion.

It's better to have done because then you know what the player is going through and you understand the pressure, but then on the other hand I know a lot of people that were good players but not good coaches, and vice versa.

To be a professional tennis player you need to put in these sort of hours.

There are some guys you have problems beating because of their style - I always had difficulties with guys like Michael Chang and Andre Agassi because their returns were so good and they played so well in defence.