Elena Rybakina of Kazakhstan hits a return during the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020. (Photos: Xinhua)

Ekaterina Alexandrova (L) of Russia and Elena Rybakina of Kazakhstan pose with their trophies during the awarding ceremony after the women's singles final match at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova of Russia hits a return during the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova (L) of Russia and Elena Rybakina of Kazakhstan pose with their trophies during the awarding ceremony after the women's singles final match at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova of Russia serves during the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova of Russia reacts after winning the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova of Russia poses with the trophy during the awarding ceremony after she won the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Elena Rybakina of Kazakhstan hits a return during the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova of Russia serves during the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova of Russia kisses the trophy during the awarding ceremony after she won the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.

Ekaterina Alexandrova of Russia hits a return during the women's singles final match between Elena Rybakina of Kazakhstan and Ekaterina Alexandrova of Russia at WTA Shenzhen Open tennis tournament in Shenzhen, south China's Guangdong Province, Jan. 11, 2020.