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HALLE, GERMANY - JUNE 20: Kei Nishikori of Japan plays a backhand during his match against Fernando Verdasco of Spain during Day 4 of the Gerry Weber Open 2017 at on June 20, 2017 in Halle, Germany. (Photo by Lars Baron/Bongarts/Getty Images)

HALLE, GERMANY - JUNE 20:  Kei Nishikori of Japan plays a backhand during his match against Fernando Verdasco of Spain during Day 4 of the Gerry Weber Open 2017 at  on June 20, 2017 in Halle, Germany.  (Photo by Lars Baron/Bongarts/Getty Images)