Women's rankings

WTA singles rankings as of 21 April 2014:

1. Serena Williams (US)

2. Li Na (Chn)

3. Agnieszka Radwanska (Pol)

4. Victoria Azarenka (Blr)

5. Simona Halep (Rom)

6. Petra Kvitova (Cze)

7. Angelique Kerber (Ger)

8. Jelena Jankovic (Ser)

9. Maria Sharapova (Rus)

10. Dominika Cibulkova (Svk)

11. Sara Errani (Ita)

12. Ana Ivanovic (Ser)

13. Flavia Pennetta (Ita)

14. Sabine Lisicki (Ger)

15. Caroline Wozniacki (Den)

16. Carla Suarez Navarro (Spa)

17. Sloane Stephens (US)

18. Eugenie Bouchard (Can)

19. Samantha Stosur (Aus)

20. Roberta Vinci (Ita)

Britons in top 300:

64. Laura Robson

118. Johanna Konta

123. Heather Watson

219. Naomi Broady

226. Samantha Murray

254. Tara Moore

283. Jade Windley