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STOKE POGES, ENGLAND - JUNE 23: Philipp Kohlschreiber of Germany plays a forehand during his match against Robin Haase of the Netherlands during Day 1 of The Boodles Tennis Event at Stoke Park on June 23, 2015 in Stoke Poges, England. (Photo by Jordan Mansfield/Getty Images)

STOKE POGES, ENGLAND - JUNE 23:  Philipp Kohlschreiber of Germany plays a forehand during his match against Robin Haase of the Netherlands during Day 1 of The Boodles Tennis Event at Stoke Park on June 23, 2015 in Stoke Poges, England.  (Photo by Jordan Mansfield/Getty Images)