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MELBOURNE, AUSTRALIA - JANUARY 18: Garbine Muguruza of Spain in action against Su-Wei Hsieh (not seen) of Taiwan during the fourth day of 2018 Australia Open at Melbourne Park in Melbourne, Australia on January 18, 2018. (Photo by Recep Sakar/Anadolu Agency/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 18: Garbine Muguruza of Spain in action against Su-Wei Hsieh (not seen) of Taiwan during the fourth day of 2018 Australia Open at Melbourne Park in Melbourne, Australia on January 18, 2018. (Photo by Recep Sakar/Anadolu Agency/Getty Images)