Mattle said:
I'm not sure that I understand you when you talk about the long L and "seeing the sun".
Fair enough. Do you see the picture of your avatar and Federer hitting the ball? Trace from the top of his shoulder, down to his hand, and out to the tip of the racquet. That is the Big L that should be maintaine as long as possible in the onehanded backhand. The small L is created in the wrist area and goes from the back of the hand, to the wrist, and then up a little on the arm. If you curl your wrist back you will see it form a small L. The smal L is a preference as to how much of an L you want to make. If you used an extreme grip, you would have to pull back the hand to make a strong L to keep the racquet face from being too closed.
If you allowed yourself to continue your swing up with the big L as high as you could get it, the strings should be facing down above you so you could look up through them and see the sun.
Obviously, not every backhand you are going to hit will be like this. As you get better, you will add your own style and preferences. Pointing this out simple is a good way to see and practice and helps promote racquet control for the onehanded backhand.
Take a look at this Haas clip when he makes contact. Study it. Note the long L, then hit next and watch how high he maintains that.
http://www.uspta.com/html/e-lesson-Backhand%20side%20view.swf
Now mind you, Haas will rotate or windshield the racquet as well, however, when you are running into inconsistency patterns with your onehander, going back to the basics is always a good thing..
Guga here is a more flamboyant player but even with his radical style, he still has the basics built in real well. Look at his followthrough and note how long he keeps that long L. This shows good strength, racquet head control, and helps him hit cleanly on a consistent basis. Yes, he can "seem" wild, but when slowed down, it is clear that he has had some excellent basic training and is a master of the fundamentals.
http://www.uspta.com/html/e-lesson-xcourt%20backhand.swf