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MELBOURNE, AUSTRALIA - JANUARY 16: Nao Hibino of Japan appears injured during her first round match against Anastasija Sevastova of Latvia on day one of the 2017 Australian Open at Melbourne Park on January 16, 2017 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 16:  Nao Hibino of Japan appears injured during her first round match against Anastasija Sevastova of Latvia on day one of the 2017 Australian Open at Melbourne Park on January 16, 2017 in Melbourne, Australia.  (Photo by Scott Barbour/Getty Images)