Even in his total massacre of Rochus, Nadal wears this expression of malice and disdain for his opponent. Even after the first three games when it was clear it was a mismatch, Nadal is just like a great white shark, brutally merciless and hungry for the slaughter. he is a total tennis wrecking machine. all about winning the match, winning major titles. the only pleasure is the victory. in a way he seems to be lacking the joy of tennis. it's all business, win win win. i guess that's what it takes to be the best in the world which he is. total committment and focus on destroying each and every prey. Sampras was like this too. No joy, just win matches. there's no relenting, one slight let up and momentum - and the match - could slip away. Nadal has an awesome killer instinct. I only saw Nadal smile once during a match, it was one year ago when Tsonga was about to finish him in the third set. After some amazing Tsonga shots at the end, Nadal smiled, like Justin Gimelstob said, it was a wry smile.