I know how my body is feeling now and that, for me, is the...

I know how my body is feeling now and that, for me, is the main reason, ... For the next two years ... I'll just have to look after my body, make sure I have massages every day, do my knee exercises, my shoulder exercises and my core exercises. There's so much. I need to do all those things if I want to be able to play as well as I have been. That's why, after the U.S. Open, I'm going to have a long break ... just to make sure that everything is right again and that I recover well.