Have you ever seen Federer or any other pros shank a forehand (Federer does it all the time just for fun I guess)? What happens when they do? Yes, the ball flies VERTICALLY up 50 stories high. What does that tell you? Yes, the racquet is predominantly moving UPWARD when it shanks the ball. That means he/she is trying to predominantly BRUSHING UP the ball instead of hitting through. IF they were trying to hit through the ball the ball would be flying diagonally instead of vertically when they shanked the ball. Any comments?