Novak Djokovic's Serve: Past, Present & Future

Returning from a nearly 6-month injury break, Novak Djokovic played a couple of exhibition matches in Kooyong and Melbourne to prep for the Australian Open. He looked good overall, but a new, abbreviated service motion appears to be a significant change in the 12-time major champions game. Joey discusses how this new motion could effect Djokovic's game going forward.
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If you haven't seen the new motion, here's a clip: twitter.com/gasparlanca/status/950927709194121216