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SHENZHEN, CHINA - JANUARY 07: Alison Riske of United States in action against Katerina Siniakova (not seen) of Czech Republic during the final match of 2017 WTA Shenzhen Open at Longgang International Tennis Center in Shenzhen, China on January 7, 2017. (Photo by Zhong Zhenbin/Anadolu Agency/Getty Images)

SHENZHEN, CHINA - JANUARY 07: Alison Riske of United States in action against Katerina Siniakova (not seen) of Czech Republic during the final match of 2017 WTA Shenzhen Open at Longgang International Tennis Center in Shenzhen, China on January 7, 2017. (Photo by Zhong Zhenbin/Anadolu Agency/Getty Images)