Yes, I really hit with him when he was 15, during a tournament in Basel, and I knew then he would be good, but not this good. If he stays healthy, it will actually be a miracle if he doesn't win more Grand Slams than Pete [Sampras]. The way he picks his shots is unbelievable. He is fast, he has a great volley, a great serve, great backhand, great everything. If I was his coach, what can I tell him? He is a magician with a racket. Even when he is playing badly, which is rarely, he can still do things with his racket nobody else can do.