Federer's Impossible Shots: W'01
I found a DVD of the Sampras-Federer Wimbledon '01 match. It's by far the most impressive match I've seen. I can see how this was the real launch of Federer's career, ultimately leading to the Wimbledon '03 triumph.
In the match, he made a backhand shot that knocked me off my feet. Sampras was at the net an hit a deep crosscourt volley to Federer's backhand. Federer tracked down the shot, moving away from the net and with his back to the net, got down low, the racquet handle moving around his right knee, the racquet almost touching the ground. He flicked the racquet around and hit a sharped angled cross-court shot that Sampras couldn't even touch. It looked like Federer made the contact with the ball behind his back.
In the match, he made a backhand shot that knocked me off my feet. Sampras was at the net an hit a deep crosscourt volley to Federer's backhand. Federer tracked down the shot, moving away from the net and with his back to the net, got down low, the racquet handle moving around his right knee, the racquet almost touching the ground. He flicked the racquet around and hit a sharped angled cross-court shot that Sampras couldn't even touch. It looked like Federer made the contact with the ball behind his back.

