Naomi Osaka of Japan, beaten by Pliskova in a marathon semi-final at Brisbane, moves up one place to third at the expense of Simona Halep, who is also fine-tuning her Australian Open challenge in Adelaide.

Serena Williams, who ended a three-year title drought with victory in Sunday’s Auckland Classic final, also moves up one place to ninth.

WTA rankings on January 13:

1. Ashleigh Barty (AUS) 7,547 pts

2. Karolina Pliskova (CZE) 5,940

3. Naomi Osaka (JPN) 5,496 (+1)

4. Simona Halep (ROU) 5,461 (-1)

5. Elina Svitolina (UKR) 5,075

6. Bianca Andreescu (CAN) 4,935

7. Belinda Bencic (SUI) 4,605 (+1)

8. Petra Kvitova (CZE) 4,436 (-1)

9. Serena Williams (USA) 4,215 (+1)

10. Kiki Bertens (NED) 4,165 (-1)

11. Madison Keys (USA) 3,072 (+2)

12. Aryna Sabalenka (BLR) 2,940 (-1)

13. Johanna Konta (GBR) 2,813 (-1)

14. Petra Martic (CRO) 2,646 (+1)

15. Sofia Kenin (USA) 2,565 (-1)

16. Marketa Vondrousova (CZE) 2,390

17. Elise Mertens (BEL) 2,250

18. Angelique Kerber (GER) 2,175

19. Alison Riske (USA) 2,130

20. Donna Vekic (CRO) 2,080



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