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Old 09-21-2012, 10:56 PM   #39
Netspirit
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Join Date: Jul 2009
Location: Bellevue, WA
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They explain it like this: "Even though the ball is struck while the head is rising, the ball travels downward toward the net because of the high ball toss and rotation of the racquet during the impact. The high ball toss means that the ball drops rapidly both before and after the impact."

I am not convinced that a high ball toss and downward ball motion is the only way to produce a twist serve, or even the best way. The ones I have seen (and attempted myself) had quite a lot of kick/topspin on them and curved up-and-down.
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