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TOKYO, JAPAN - OCTOBER 07: Nick Kyrgios of Australia plays a forehand during the men's singles quarterfinal match against Gilles Muller of Luxemburg on day five of Rakuten Open 2016 at Ariake Colosseum on October 7, 2016 in Tokyo, Japan. (Photo by Arrow Press/Getty Images)

TOKYO, JAPAN - OCTOBER 07:  Nick Kyrgios of Australia plays a forehand during the men's singles quarterfinal match against Gilles Muller of Luxemburg on day five of Rakuten Open 2016 at Ariake Colosseum on October 7, 2016 in Tokyo, Japan.  (Photo by Arrow Press/Getty Images)