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HALLE, GERMANY - JUNE 16: Kei Nishikori of Japan speaks at the press conference after winning his match against Dominic Thiem of Germany during day two of the Gerry Weber Open at Gerry Weber Stadium on June 16, 2015 in Halle, Germany. (Photo by Thomas Starke/Bongarts/Getty Images)

HALLE, GERMANY - JUNE 16:  Kei Nishikori of Japan speaks at the press conference after winning his match against Dominic Thiem of Germany during day two of the Gerry Weber Open at Gerry Weber Stadium on June 16, 2015 in Halle, Germany.  (Photo by Thomas Starke/Bongarts/Getty Images)