Women's tennis rankings

WTA singles rankings as of 18 May 2015

1. Serena Williams (US)

2. Maria Sharapova (Rus)

3. Simona Halep (Rom)

4. Petra Kvitova (Cze)

5. Caroline Wozniacki (Den)

6. Eugenie Bouchard (Can)

7. Ana Ivanovic (Ser)

8. Carla Suarez Navarro (Spa)

9. Ekaterina Makarova (Rus)

10. Andrea Petkovic (Ger)

11. Angelique Kerber (Ger)

12. Karolina Pliskova (Cze)

13. Lucie Safarova (Cze)

14. Agnieszka Radwanska (Pol)

15. Venus Williams (US)

16. Madison Keys (US)

17. Sara Errani (Ita)

18. Svetlana Kuznetsova (Rus)

19. Elina Svitolina (Ukr)

20. Sabine Lisicki (Ger)

Britons in top 300:

43. Heather Watson

144. Johanna Konta

236. Naomi Broady

283. Katy Dunne