Alex de Minaur has moved up seven places to No.31 in the latest world tennis rankings, while US Open winner Rafael Nadal is within touching distance of Novak Djokovic in the battle for No.1.

De Minaur defeated Japanese seventh seed Kei Nishikori during an impressive US Open run, which ended when the 20-year-old Australian lost to Grigor Dimitrov in the fourth round in New York.

De Minaur is 70 rankings points behind top-ranked Australian Nick Kyrgios, who moves up three places to world No.27.

Spaniard Nadal remains second in the standings, released on Monday by the ATP, but is just 640 points off Serb Djokovic’s total of 9865.

While Nadal won his 19th major on Sunday (Monday AEST), defending champion Djokovic exited Flushing Meadows injured in the quarter-finals.

Russia’s Daniil Medvedev moved up a spot to fourth after making his maiden grand-slam final, while Italy’s Matteo Berrettini surged 12 places to 13th after a run to the last four.

ATP TOP 10 as of September 9 (previous ranking in parenthesis):

1. (1) Novak Djokovic, Serbia, 9865 points

2. (2) Rafael Nadal, Spain, 9225

3. (3) Roger Federer, Switzerland, 7130

4. (5) Daniil Medvedev, Russia, 5235

5. (4) Dominic Thiem, Austria, 4575

6. (6) Alexander Zverev, Germany, 4095

7. (8) Stefanos Tsitsipas, Greece, 3420

8. (7) Kei Nishikori, Japan, 3375

9. (9) Karen Khachanov, Russia, 2810

10. (10) Roberto Bautista Agut, Spain, 2575