"Why hasn’t clay been as easy for me as the other surfaces? Why haven’t I been as dominant? It’s because on the other surfaces I can play my game without thinking. Everything happens naturally: I can go from defense to attack when and how I want. On clay you don’t need a volley or a serve. You just need legs, an incredible forehand and backhand, and to run after every ball. I’m not trying to take anything from Rafa: he has been successful in other surfaces as well. But on clay you can get away, you can be competitive even with a very incomplete game. I’m not saying it’s so simple, but it’s too easy. I’ve had to learn to control my aggression. I love to end points quickly, with a couple of shots. On clay, you can do it 50% of the time, but if you take too many risks you’re gifting the other 50%. I learned to play from way behind the baseline and to use angles. It was a lesson in geometry. On clay you can play well and lose. What you have to do is to play smart."
-- Fed, on why his super amazingly complete and beautiful game isn't suited for the crude dirt of clay, where incomplete athletes are consistently rewarded. Or something.