I hate to lose more than I love to win.

I think my greatest victory was every time I walked out there, I gave it everything I had. I left everything out there. That's what I'm most proud of. I can't go win Wimbledon anymore, so if what I've done in the past is not good enough, let it go. Because I'm certainly not sitting around thinking about it.

There was never anything I wanted to do more than play tennis. Never once walked out there and thought, 'I wish I was doing something else.' Not once.

From where we lived, to practise in St Louis was an hour-and-a-half drive each way, so that took a lot of the time. So really, our lives just took different paths.

That's something a lot of athletes miss - a lot of them walk away too soon. They don't get everything out of their system. They have a lot of what-ifs when they're sitting around later in life. I don't have that. I got all that out of my system. I pushed it to the brink, I loved it, and when I walked away, I'd had enough.

I don't go out there to love my enemy. I go out there to squash him.

[In the modern game] you're either a clay court specialist, a grass court specialist or a hard court specialist... or you're Roger Federer...