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STOKE POGES, ENGLAND - JUNE 25: Novak Djokovic of Serbia serves during his match against Richard Gasquet of France during Day 3 of The Boodles Tennis Event at Stoke Park on June 25, 2015 in Stoke Poges, England. (Photo by Jordan Mansfield/Getty Images)

STOKE POGES, ENGLAND - JUNE 25:  Novak Djokovic of Serbia serves during his match against Richard Gasquet of France during Day 3 of The Boodles Tennis Event at Stoke Park on June 25, 2015 in Stoke Poges, England.  (Photo by Jordan Mansfield/Getty Images)