Unit Turn
Acasuso establishes a hitting structure in the first frame and then fully coils his upper body. Note the height he gets in the racket head as he fully coils up. This combination of being fully coiled, with height in the racket head, will allow a kinetic chain to develop.

First let's talk about the hitting structure he establishes right away. In the first frame, his hitting arm is almost straight. All top one handers hit the ball with a straight (or near straight) hitting arm, so it is best to establish a near straight arm from the very beginning.

In the first frame, also notice the "little L" formed between the top of Acasuso's right hitting hand and his forearm. This "little L" is like a solid support mechanism that makes contact very strong and well supported by the arm and shoulder. He establishes this in the very first frame and will keep it intact through the entire shot.

Now for the unit turn. Look at how Acasuso's left hand grips the throat of the racket in the first frame. He keeps his hand on the throat of the racket until the final frame in the sequence. Like with the forehand, keeping this off hand on the racket assures that the shoulders will fully coil. Evidence of a full shoulder coil is Acasuso's chin touching the top of his right shoulder in the final frame. He is fully coiled and wound up. Note how his shoulders are coiled farther than his waist. This really creates a wound up effect.

Finally, his hitting hand is in line with his right shoulder and his racket is pointing upwards. This height in the racket will add to the uncoiling effect.



Lower the Structure