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HALLE, GERMANY - JUNE 13: Lucas Pouille of France plays a backhand in his match against Kei Nishikori of Japan 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:  Lucas Pouille of France plays a backhand in his match against Kei Nishikori of Japan 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)