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Japan's Kei Nishikori smashes his racket after losing the first set during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP PHOTO / Yasuyoshi Chiba (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

Japan's Kei Nishikori smashes his racket after losing the first set during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP PHOTO / Yasuyoshi Chiba        (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

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Japan's Kei Nishikori smashes his racket after losing the first set during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP PHOTO / Yasuyoshi Chiba (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

Japan's Kei Nishikori smashes his racket after losing the first set during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP PHOTO / Yasuyoshi Chiba        (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

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Japan's Kei Nishikori walks with his smashed racket after losing the first set during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP / Yasuyoshi Chiba (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

Japan's Kei Nishikori walks with his smashed racket after losing the first set during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP / Yasuyoshi Chiba        (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

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Japan's Kei Nishikori reacts during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP / Yasuyoshi Chiba (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

Japan's Kei Nishikori reacts during their ATP World Tour 500 Rio Open against Brazil's Thomaz Bellucci at Jockey Club in Rio de Janeiro, Brazil, on February 21, 2017. / AFP / Yasuyoshi Chiba        (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

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RIO DE JANEIRO, BRAZIL - FEBRUARY 21: Kei Nishikori of Japan returns a shot to Thomaz Bellucci of Brazil during the ATP Rio Open 2017 at Jockey Club Brasileiro on February 21, 2017 in Rio de Janeiro, Brazil. (Photo by Buda Mendes/Getty Images)

RIO DE JANEIRO, BRAZIL - FEBRUARY 21: Kei Nishikori of Japan returns a shot to  Thomaz Bellucci of Brazil during the ATP Rio Open 2017 at Jockey Club Brasileiro on February 21, 2017 in Rio de Janeiro, Brazil. (Photo by Buda Mendes/Getty Images)