Check out this YouTube clip of the highlights from ATP World Tour Finals SF between Federer and Murray. Between the 3:10 - 3:45 minute mark, there's a sick point that causes Robbie Koenig to say something unforgettable: "This is pure genius. You can't teach shots like this. That's a half-volley, open stance, with a single-handed backhand. Last time we saw one of those, God was a boy." I guess when you've watched Federer for roughly 15 years on tour it's hard to find the words to describe utter greatness.