Couple of Serve questions
When I flat serve and it goes in, it's pretty much always on the line or very close to it.
I read something somewhere that if you're not able to serve in the middle of the box then there's something wrong with your technique? (you shouldn't be hitting down, or something like that)
Also for top spin serves do you make contact with your body still at 90 degrees to the court and do you pronate after you make contact with ball, before or during contact?