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STOKE POGES, ENGLAND - JUNE 22: Novak Djokovic of Serbia (C) talks with his coach Boris Boris Becker (L) and his fitness coach Gebhard Phil-Gritsch trainer (R) during a practice session during day two of The Boodles Tennis Event at Stoke Park on June 22, 2016 in Stoke Poges, England. (Photo by Jordan Mansfield/Getty Images)

STOKE POGES, ENGLAND - JUNE 22:  Novak Djokovic of Serbia (C) talks with his coach Boris Boris Becker (L) and his fitness coach Gebhard Phil-Gritsch trainer (R) during a practice session during day two of The Boodles Tennis Event at Stoke Park on June 22, 2016 in Stoke Poges, England.  (Photo by Jordan Mansfield/Getty Images)