This graphic shows a very interesting point of the complexity of tennis! (Thanks to FeelTennis.net for this). It shows, that little changes in the timing of a tennis stroke may change your whole game.
Thinking back to studies about „Choking under pressure“, we „know“, that using the prefrontal cortex and thinking about the process of a stroke will slow the execution of your move and may lead to a discrepancy to the optimal hit. It is then nearly impossible, to hit the ball like you would do without thinking! I remember a study, that shows clear temporal lags!