Barbora Krejcikova (R)/Katerina Siniakova of Czech Republic pose with the trophy during the awarding ceremony after the women's doubles final match against Zheng Saisai/Duan Yingying of China at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Barbora Krejcikova (front R)/Katerina Siniakova of Czech Republic pose with the trophy during the awarding ceremony after the women's doubles final match against Zheng Saisai/Duan Yingying of China at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Zheng Saisai (L)/Duan Yingying of China react during the women's doubles final match against Barbora Krejcikova/Katerina Siniakova of Czech Republic at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Zheng Saisai (R)/Duan Yingying of China compete during the women's doubles final match against Barbora Krejcikova/Katerina Siniakova of Czech Republic at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Barbora Krejcikova (L)/Katerina Siniakova of Czech Republic react during the women's doubles final match against Zheng Saisai/Duan Yingying of China at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Barbora Krejcikova (R)/Katerina Siniakova of Czech Republic celebrate after the women's doubles final match against Zheng Saisai/Duan Yingying of China at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Zheng Saisai (R)/Duan Yingying of China pose with the trophy during the awarding ceremony after the women's doubles final match against Barbora Krejcikova/Katerina Siniakova of Czech Republic at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Barbora Krejcikova (L)/Katerina Siniakova of Czech Republic celebrate during the women's doubles final match against Zheng Saisai/Duan Yingying of China at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)

Zheng Saisai (top)/Duan Yingying of China compete during the women's doubles final match against Barbora Krejcikova/Katerina Siniakova of Czech Republic at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong province, Jan. 11, 2020. (Xinhua/Mao Siqian)