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Old 03-01-2013, 08:54 PM   #70
Join Date: Feb 2013
Posts: 66

Originally Posted by toly View Post
IMO you are right.
When pros hit flat serve they often use intense wrist extension and then wrist flexion. The wrist extension brings the racquet in semi open position, so they cannot ‘swing up on edge’, see figure below and post

do you realize the arm is already straight in each of these frames?
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