Women's rankings

WTA singles rankings as of 15 December 2014:

1. Serena Williams (US)

2. Maria Sharapova (Rus)

3. Simona Halep (Rom)

4. Petra Kvitova (Cze)

5. Ana Ivanovic (Ser)

6. Agnieszka Radwanska (Pol)

7. Eugenie Bouchard (Can)

8. Caroline Wozniacki (Den)

9. Angelique Kerber (Ger)

10. Dominika Cibulkova (Svk)

11. Ekaterina Makarova (Rus)

12. Flavia Pennetta (Ita)

13. Andrea Petkovic (Ger)

14. Sara Errani (Ita)

15. Jelena Jankovic (Ser)

16. Lucie Safarova (Cze)

17. Carla Suarez Navarro (Spa)

18. Venus Williams (US)

19. Alize Cornet (Fra)

20. Garbine Muguruza (Spa)

Britons in top 300:

49. Heather Watson

148. Johanna Konta

171. Naomi Broady