(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)