US and Australian Open champion Naomi Osaka returned to the world No 1 spot in the WTA rankings on Monday.

The 21-year-old lost to Serena Williams in the quarter-finals of last week’s Rogers Cup but benefitted from the second round defeat of former No 1 Ashleigh Barty and the failure of Karolina Pliskova to reach the semis in Toronto.

Osaka first hit top spot in January, after winning back-to-back majors in New York and Melbourne, making history as the first Japanese player to achieve it.

After seven weeks on top, Barty slips to second with Pliskova in third. The only other movement in the top 10 sees Williams, finalist in Toronto, climbing two places to eight with Sloane Stephens going in the other direction.

Canadian Bianca Andreescu, who won the Rogers Cup following Williams’ withdrawal with back spasms in the opening set of the final, climbs 13 places to 14.

Djokovic continues to reign supreme

Rafael Nadal’s Rogers Cup win in Montreal at the weekend marked a significant step for the Spaniard as he prepares for the US Open but it wasn’t enough to topple Novak Djokovic at the top of the ATP rankings, released on Monday.

Nadal, who will be vying for a fourth title at Flushing Meadows, was too strong for Daniil Medvedev in Sunday’s final, seeing off the Russian 6-3, 6-0 to claim his 35th Masters title.

Roger Federer and Dominic Thiem stay third and fourth respectively. Stefanos Tsitsipas, who entered the top five for the first time last week, drops two places and is leapfrogged by Kei Nishikori and Alexander Zverev. Medvedev’s reward for his appearance in Sunday’s final was a one-place climb to eight.

Women’s rankings

1. Naomi Osaka - 6,417 pts (+1)

2. Ashleigh Barty - 6,256 (-1)

3. Karolina Pliskova - 6,185

4. Simona Halep - 5,223

5. Kiki Bertens - 5,120

6. Petra Kvitova - 4,780

7. Elina Svitolina - 4,577

8. Serena Williams - 3,995 (+2)

9. Aryna Sabalenka - 3,565

10. Sloane Stephens - 3,189 (-2)

11. Anastasija Sevastova - 3,167

12. Belinda Bencic - 3,008

13. Angelique Kerber - 2,875

14. Bianca Andreescu - 2,837 (+13)

15. Johanna Konta - 2,695 (-1)

16. Marketa Vondrousova - 2,652 (-1)

17. Qiang Wang - 2,647 (-1)

18. Madison Keys - 2,557 (-1)

19. Caroline Wozniacki - 2,537 (-1)

20. Anett Kontaveit - 2,380 (-1)

40. Victoria Azarenka (-1)

65. Venus Williams (-9)

97. Maria Sharapova (-16)

Men’s rankings

1. Novak Djokovic - 12,325 pts

2. Rafael Nadal - 7,945

3. Roger Federer - 7,460

4. Dominic Thiem - 4,925

5. Kei Nishikori - 4,040 (+1)

6. Alexander Zverev - 4,005 (+1)

7. Stefanos Tsitsipas - 3,455 (-2)

8. Daniil Medvedev - 3,230 (+1)

9. Karen Khachanov - 2,890 (-1)

10. Fabio Fognini - 2,555 (+1)

11. Roberto Bautista - 2,395 (+2)

12. Juan Martin Del Potro - 2,230

13. Borna Coric - 2,195 (+1)

14. Kevin Anderson - 2,140 (-4)

15. Gaël Monfils - 2,130 (+5)

16. John Isner - 2,040 (-1)

17. Nikoloz Basilashvili - 2,020

18. Marin Cilic - 1,940 (-2)

19. David Goffin - 1,815 (-1)

20. Milos Raonic - 1,810 (-1)

23. Stan Wawrinka - 1,670 (-1)

27. Nick Kyrgios - 1,475