Backscratch

The position of the racquet head, held over the shoulder and behind the back, between the shoulder blades, during the service motion. The term is used by tennis professionals in teaching a pupil how to serve. As the ball is tossed up for a serve, the racquet arm sweeps around high and to rear, with the wrist cocked so that the head of the racquet drops down into the "backscratching position." It's the equivalent of a full wind-up in baseball.