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TOKYO, JAPAN - OCTOBER 08: David Goffin of Belgium plays a backhand during the men's singles semifinal match against Marin Cilic of Croatia on day six of Rakuten Open 2016 at Ariake Colosseum on October 9, 2016 in Tokyo, Japan. (Photo by Chung Sung-Jun/Getty Images)

TOKYO, JAPAN - OCTOBER 08:  David Goffin of Belgium plays a backhand during the men's singles semifinal match against Marin Cilic of Croatia on day six of Rakuten Open 2016 at Ariake Colosseum on October 9, 2016 in Tokyo, Japan.  (Photo by Chung Sung-Jun/Getty Images)