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Barbora Krejcikova (Top L) and Katerina Siniakova (Top R) of the Czech Republic and Barbora Strycova (bottom L) of the Czech Republic and Hsieh Su-wei of Chinese Taipei compete during the doubles round robin match at the WTA finals Tennis Tournament in Shenzhen, south China's Guangdong Province, Oct. 29, 2019. (Xinhua/Liang Xu)