Question: who is currently ranked number one in women's tennis
Answer: ( 2 ) Jul 9 , 2012 Feb 17 , 2013 32 51 USA Serena Williams ( 6 ) Feb 18 , 2013 Sep 11 , 2016 186 309 22 GER Angelique Kerber Sep 12 , 2016 Jan 29 , 2017 20 20 USA Serena Williams ( 7 ) Jan 30 , 2017 Mar 19 , 2017 7 316 GER Angelique Kerber ( 2 ) Mar 20 , 2017 Apr 23 , 2017 5 25 USA Serena Williams ( 8 ) Apr 24 , 2017 May 14 , 2017 319 GER Angelique Kerber ( 3 ) May 15 , 2017 Jul 16 , 2017 9 34 23 CZE Karolína Plíšková Jul 17 , 2017 Sep 10 , 2017 8 8 24 ESP Garbiñe Muguruza Sep 11 , 2017 Oct 8 , 2017 25 ROU Simona Halep Oct 9 , 2017 Jan 28 , 2018 16 16 DEN Caroline Wozniacki ( 3 ) Jan 29 , 2018 Feb 25 , 2018 71 ROU Simona Halep ( 2 ) Feb 26 , 2018 Present 17