What werekitten says is true.
For it to callibrate "on the fly" it woulneed you to point at the screen on occasion.... so it depends how fast it can callibrate and whether it can do it during fast motion.
If it can callibrate fast/in motion then I suppose it won't matter as the likely hood is you will point at the screen quite a bit in a Tennis game.
If not, then it really doesn't matter too much that you have to let it callirate at the start of a match as in Virtua Tennis, it's no more hassle than going through an extra menu screen.








