This pronation still is probably the most confusing and bipolar topic in tennis.
How much pronation is enough to get max out of your serve I wonder.
There are a ton of high level players who pronate till contact and even slightly after contact, but they do not continue to pronate till the absolute end so that their strings face the right side or even upwards in some cases.
Then there are high level players who pronate till contact and after contact and even after that till the racquet is pointed completely right or upwards.
The question is how much if any do these effects affect the serve.
Both pronate till contact and after contact, but some stop the internal rotation and pronation earlier and some let it stop when it reaches the end of the joint motion.
Maybe could be related to the toss and swingpath and everything.
But certainly a vast majority of WTA players, some ATP players and a vast majority of D1 college players pronate till slightly after the ball leaves the racquet and then pull the racquet down, instead of leting it pronate so the racquet faces the right side.
If you look in slow motion a few serves from start from both guys you can see most of their serves have these qualities, here and there a serve might have that full motion pronation.
Thiem, sometimes have that full motion pronation and sometimes just slightly after contact
Djokovic here no full pronation but sometimes does fully pronate
I think this topic is quite complex and interesting and very bipolar
But from video evidence its clear we have high level players at D1 college levels, Futures, WTA and ATP who either:
1.Pronate up till contact and then let the wrist snap forward instead of continuing to pronate (The racquet face rotates till contact and then stops rotating even slightly before and instead starts snaping down via wrist)
2.Pronate up till contact and slightly after contact but then stop pronating as they pull the arm down earlier (The racquet face rotates till contact and after contact continues to rotate but then stops at some point, sooner or later and faces slightly sideways)
3.Pronate up till contact and let the racquet pronate till the end of the joint motion (The racquet face rotates till contact and after contact continues to rotate and continues so till the end of the joint natural motion and faces very sideways or even upwards)
4.Depending on the serve do variations of 2. and 3. or sometimes even 1.