Originally Posted by user92626
And who in here
is an expert in biomechanics?
I rather believe Djo than LeeD, who asserts that Djok "doesn't know what he's talking about". Which has a higher probability of happening here: Djo not knowing the tennis stroke he's describing or guys like LeeD knowing what the pinnacle of tennis is like?
We may not be experts in biomechanics but I am willing to wager a tidy sum that I've done more reading/studying the subject that Novak Djoko has. I've also been playing the game twice long as he has (some 20 years longer) -- I've managed to pick up quite a bit of knowledge on tennis theory in my scant 40 years of playing (even tho' I did not start til I was nearly 21). I believe that LeeD has been playing longer than I have and has also garnered quite a bit of insight in those years.
While Novak has achieved an extremely high level of skill in tennis, much of his tennis knowledge is at a subconscious kinesthetic level. This does not necessarily translate to the ability to analyze stroke mechanics and teach it effectively to others. Those are different cognitive skills than the highly-developed kinesthetic intelligence that Novak possesses.
Also keep in mind that English is not Novak's mother tongue. He may or may not be able to accurately describe the nuances of his own stroke production in English (or even in his native tongue for that matter).
Novak may very well be able to perceive his own strokes in a certain way whether that perception is technically accurate or not. His flawed instruction may very well work for some students of the game. However, for many others, it could lead to exaggerated/forced wrist actions or flawed stroke mechanics that could be detrimental to their tennis or, worse, to their body.
While Novak may be aware of the concept of pronation, it is possible that he may lost if you start talking about supination, internal shoulder rotation, ulnar deviation, etc. Note that many high-level touring pros could not tell you the difference between a full Western grip, a semi-Western grip and a Kung Fu grip.