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Anna-Lena Groenefeld (Top R) of Germany and Demi Schuurs (Top L) of the Netherlands compete during the doubles round robin match against Timea Babos of Hungary and Kristina Mladenovic of France at the WTA Finals Tennis Tournament in Shenzhen, south China's Guangdong Province, Oct. 30, 2019. (Xinhua/Liang Xu)