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HALLE, GERMANY - JUNE 13: Kei Nishikori of Japan plays a forehand in his match against Lucas Pouille of France during day one of the Gerry Weber Open at Gerry Weber Stadium on June 13, 2016 in Halle, Germany. (Photo by Thomas Starke/Bongarts/Getty Images)

HALLE, GERMANY - JUNE 13:  Kei Nishikori of Japan plays a forehand in his match against Lucas Pouille of France during day one of the Gerry Weber Open at Gerry Weber Stadium on June 13, 2016 in Halle, Germany.  (Photo by Thomas Starke/Bongarts/Getty Images)