I personally have never been able to hit a tweener in an official match, but what about you? If you don't know what a tweener is, you may call it something else like the hotdog or whatever. Still don't know what it is? It is the shot Federer hit against Djokovic at last year's US Open and against Dabul at this year's Open. The shot everyone talks about. It is the shot that makes your opponent rage for hours on end if you pull it off.
But yeah, post your experiences with trying to hit a tweener in a match or actually making one. I have pulled off a tweener one time in practice, but never in an official USTA or high school match. I can get the ball over the net for the most part, but it always goes long