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HALLE, GERMANY - JUNE 19: Kei Nishikori of Japan plays a forehand in his match against Jerzy Janowicz of Poland during day five of the Gerry Weber Open at Gerry Weber Stadium on June 19, 2015 in Halle, Germany. (Photo by Thomas Starke/Bongarts/Getty Images)

HALLE, GERMANY - JUNE 19:  Kei Nishikori of Japan plays a forehand in his match against Jerzy Janowicz of Poland during day five of the Gerry Weber Open at Gerry Weber Stadium on June 19, 2015 in Halle, Germany.  (Photo by Thomas Starke/Bongarts/Getty Images)