Paris - Italian Matteo Berrettini moved into the Top 10 for the first time in his career when the ATP rankings were released on Monday.
The 23-year-old, who reached the semi-finals in Vienna last week before losing to eventual winner Dominic Thiem, climbs two places to No 9.
Berrettini was ranked 53rd a year ago but has climbed steadily in 2019, winning two ATP events in Budapest and Stuttgart and progressing to the semi-finals of the US Open where he lost to Rafael Nadal.
He is currently eighth in the Race to London and will secure his place at the year-ending ATP Finals if he reaches the final of this week's Paris Masters.
Meanwhile, Russian Karen Khachanov moves up one place to eighth while Kei Nishikori, who has not played since the US Open and underwent surgery on his right elbow last week, slips out of the Top 10, down three places to 11th.
Novak Djokovic stays at No 1, the 275th week in his career that he holds the top spot, but is set to lose the position next week to Nadal.
On the 52-week rolling points system, Djokovic will lose the points he gained in London a year ago in a competition where the Spaniard did not compete.
Top 20 in the latest ATP Tour rankings:
1. Novak Djokovic (SRB) 9,545
2. Rafael Nadal (ESP) 9,225
3. Roger Federer (SUI) 6,950
4. Daniil Medvedev (RUS) 5,740
5. Dominic Thiem (AUT) 5,495
6. Alexander Zverev (GER) 4,335
7. Stefanos Tsitsipas (GRE) 3,830
8. Karen Khachanov (RUS) 2,830
9. Matteo Berrettini (ITA) 2,705
10. Roberto Bautista (ESP) 2,575
11. Kei Nishikori (JPN) 2,560
12. Fabio Fognini (ITA) 2,370
13. Gal Monfils (FRA) 2,350
14. David Goffin (BEL) 2,325
15. Diego Schwartzman (ARG) 2,205
16. Stan Wawrinka (SUI) 1,910
17. John Isner (USA) 1,850
18. Alex De Minaur (AUS) 1,695
19. Felix Auger-Aliassime (CAN) 1,681
20. Guido Pella (ARG) 1,620
45. Kevin Anderson (RSA) 1,100
103. Lloyd Harris (RSA) 547