It's pretty high up there on the list. Being able to return a serve at that speed is one of the biggest things that separates the professionals from the recreational players.

I don't think anyone in their right mind takes me serious.

I think I've always had a decent perspective on wins and losses on the tennis court.

I had a very detailed retirement plan, and I feel like I've met every aspect of it: a lot of golf, a lot of carbs, a lot of fried food, and some booze, occasionally - I've been completely committed... The results have shown.

Stay in school kids or you'll end up being an umpire.

I don't want to live and die with every point that's being played out there now. I'm going to let my coach live and die with every point.

I always said if I had to pick one Grand Slam to win, it would be the U.S. Open.