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Old 01-25-2013, 09:09 PM   #6
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Join Date: May 2012
Posts: 41

Here's a clip where various pros hit it:

I think it must be a modern technique since it is hit from an open stance and it uses the idea of torque and angular momentum as opposed to linear momentum. So I'm guessing that somebody "invented" it post-Borg but I don't know enough tennis history to know when it first appeared.
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