Karolina Pliskova of Czech Republic attends the WTA Finals singles draw ceremony at the Marina Bay Sands in Singapore, Oct. 21, 2016. The WTA Finals 2016 will be held in Singapore on Oct. 23 to 30. (Xinhua/Then Chih Wey)
(L to R, rear) Karolina Pliskova of Czech Republic, Garbine Muguruza of Spain, Madison Keys of the United States, Dominika Cibulkova of Slovakia, (L to R, front) Simona Halep of Romania, Angelique Kerber of Germany, Agnieszka Radwanska of Poland pose during WTA Finals singles draw ceremony at the Marina Bay Sands in Singapore, Oct. 21, 2016. The WTA Finals 2016 will be held in Singapore on Oct. 23 to 30. (Xinhua/Then Chih Wey)
Garbine Muguruza of Spain poses with fans during WTA Finals single's draw ceremony at the Marina Bay Sands in Singapore, Oct. 21, 2016. The WTA Finals 2016 will be held in Singapore on Oct. 23 to 30. (Xinhua/Then Chih Wey)
(L to R, Rear) Karolina Pliskova of Czech Republic, Garbine Muguruza of Spain, Madison Keys of the United States, Dominika Cibulkova of Slovakia, (L to R, Front) Simona Halep of Romania, Angelique Kerber of Germany, Agnieszka Radwanska of Poland attend WTA Finals singles draw ceremony at the Marina Bay Sands in Singapore, Oct. 21, 2016. The WTA Finals 2016 will be held in Singapore on Oct. 23 to 30. (Xinhua/Then Chih Wey)
Agnieszka Radwanska of Poland attends the WTA Finals singles draw ceremony at the Marina Bay Sands in Singapore, Oct. 21, 2016. The WTA Finals 2016 will be held in Singapore on Oct. 23 to 30. (Xinhua/Then Chih Wey)