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HALLE, GERMANY - JUNE 18: Kei Nishikori of Japan playes a forehand during his match against Matthias Bachinger of Germany during day 1 of the Gerry Weber Open at Gerry Weber Stadium on June 18, 2018 in Halle, Germany. (Photo by Thomas Starke/Getty Images)

HALLE, GERMANY - JUNE 18: Kei Nishikori of Japan playes a forehand during his match against Matthias Bachinger of Germany during day 1 of the Gerry Weber Open at Gerry Weber Stadium on June 18, 2018 in Halle, Germany. (Photo by Thomas Starke/Getty Images)