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    jusr took time to give it a real god look. Fascinating is not only racket path and impact, but also to see the direction of the rotation of the ball after impact. What is apparent is the amount of sidespin, imparted by the outward trajectory of the racket after impact.
    Last edited by gzhpcu; 09-06-2017, 10:21 AM.

  • #2
    John, even Stosur's kick serve has the ball after impact showing very little topspin, seems mostly sidespin! Wonder where the dipping effect comes from...

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