The time your game is most vulnerable is when you're ahead; never let up.
When you have the opportunity, you strike.
The next point - that's all you must think about.
I like to let my racket do the talking.
The roughest thing I ever said to an umpire was, 'Are you sure?'
I often surprise myself. You can't plan some shots that go in, not unless you're on marijuana, and the only grass I'm partial to is Wimbledon's.