Early in my career, I struggled with consistency, but I couldn't get more consistent than this year.

When they [court announcers] say, 'This is the world No. 2,' it just doesn't sound right to me because either I'm No. 1 or I'm a grand slam champion. I'm not world No. 2. I just don't like the ring of it when I'm introduced on court because I've been up there for so, so long.

Clearly, when you win everything, it's fun. That doesn't necessarily mean you love the game more.

You can be stubborn and successful or you can give it up a bit and change things around. For me it's important to have a bit of both.

What I think I've been able to do well over the years is play with pain, play with problems, play in all sorts of conditions.

It doesn't need to be the same every day, doesn't need to be the same shower I use, the same restaurant I go to, the same hour I go to sleep. I've always been very flexible. I don't care if I practice at nine in the morning or 10 P.M.

Once you find that peace, that place of peace and quiet, harmony and confidence, that's when you start playing your best.