Cocking the wrist at the unit turn position for the forehand?

zill

Professional
Some players do it. Not many though. Prominent ones are Nadal and Wawrinka. Why do they do it? What do they get from it?

By cocking I mean slanting the racquet inwards towards them at the unit turn position. Stan does this big time on the backhand side as well.


At 0:03 here

 
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