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SHENZHEN, CHINA - JANUARY 02: Agnieszka Radwanska of Poland returns a shot during the match against Ying-Ying Duan of China during Day 2 of 2017 WTA Shenzhen Open at Longgang International Tennis Center on January 2, 2017 in Shenzhen, China. (Photo by Zhong Zhi/Getty Images)

SHENZHEN, CHINA - JANUARY 02:  Agnieszka Radwanska of Poland returns a shot during the match against Ying-Ying Duan of China during Day 2 of 2017 WTA Shenzhen Open at Longgang International Tennis Center on January 2, 2017 in Shenzhen, China.  (Photo by Zhong Zhi/Getty Images)