In general, Jack has mastered in both strokes the art of the close to optimal body energy unloading (=Tennis 3.0), which goes over the targeted pronation of the entire limb (long-axis pronation). This targeted pronation is possible when, among other conditions, a perfect eye control of the ball leading to optimal spacing is present. Some of the other conditions necessary...
....they also made some improvements on Jack's backhand and then some serious work has been done on Jack's service, which can be considered as quite a weapon now. In this article, I would like to focus on some qualities of this "new Sock service", as he showed them at the ATP 500 tournament in Basel (SUI) few weeks ago already, just before the above mentioned Paris event....
But in both cases shown here, Ernesto didn't create an optimal space to be able to throw his elbow and racket away from the body against the target and the result was in both cases just a mediocre forehand, which was not putting the opponent under significant pressure. The main reason behind the suboptimal spacing might then not be primarily in the poor footwork capacity, but much rather in...
