Since he and his partner have been winning more tournaments recently (DO and FO), I've been watching more of his matches recently. He has an incredible intensity and desire when he plays that is lacking in so many other pro players. However, I've noticed that his serves have a double action every single time. The racket face will go forwards by 1-2 inches and then he'll pull it back to restart another forward motion, this time hitting the bird. I'm quite surprised that he hasn't been penalized on this by the service judges. Any one else notice this?