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Paris - Naomi Osaka narrowly retained her No 1 ranking on Monday ahead of Simona Halep after the Romanian missed the chance to reclaim top spot following defeat in the Madrid Open final.
The 21-year-old Osaka lost in the last eight in the Spanish capital, but the Japanese star will stay at the summit for at least another week as Halep was beaten 6-4, 6-4 by Kiki Bertens.
The Dutchwoman became the first woman to win Madrid without dropping a set and climbed to a career-high ranking of fourth following the biggest title of her career.
Angelique Kerber moved up one place to third, while last year's Madrid champion Petra Kvitova slipped three spots to fifth.
Switzerland's Belinda Bencic continued her resurgence by jumping from 18th to 15th after beating Osaka on her run to the semi-finals.
Top 20 in the latest WTA Tour rankings:
1. Naomi Osaka (JPN) 6 356 pts
2. Simona Halep (ROM) 6 117
3. Angelique Kerber (GER) 5 285
4. Kiki Bertens (NED) 5 115
5. Petra Kvitova (CZE) 5 050
6. Elina Svitolina (UKR) 4 866
7. Karolina Pliskova (CZE) 4 786
8. Sloane Stephens (USA) 4 656
9. Ashleigh Barty (AUS) 4 425
10. Aryna Sabalenka (BLR) 3 500
11. Serena Williams (USA) 3 461
12. Caroline Wozniacki (DEN) 3 252
13. Anastasija Sevastova (LAT) 3 240
14. Madison Keys (USA) 3 010
15. Belinda Bencic (SUI) 2 888
16. Anett Kontaveit (EST) 2 855
17. Wang Qiang (CHN) 2 815
18. Julia Goerges (GER) 2 520
19. Garbine Muguruza (ESP) 2 415
20. Elise Mertens (BEL) 2 305
