It's a tough world out there and all the guys are fighting hard and the competition is really tough.
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.
But I still serve pretty big and that's one of my biggest weapons, so if my shoulder holds up and I can count on it, I can win a few matches and then you never know how the other guys are going to react to the fatigue and the length of the matches.
When you are a professional sportsman all the guys are great competitors in the top 50.
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.