Further down the rankings, Russia's Mikhail Kukushkin rocketed 17 spots to the 54th after he had reached the Vienna Open semi-finals, where he lost to Nishikori.
The current top-10 ATP rankings and point scores are as follows:
1. Rafael Nadal (Spain) 7,660 Points
2. Novak Djokovic (Serbia) 7,445
3. Roger Federer (Switzerland) 6,260
4. Juan Martin del Potro (Argentina) 5,460
5. Alexander Zverev (Germany) 5,115
6. Kevin Anderson (South Africa) 4,230
7. Marin Cilic (Croatia) 4,050
8. Dominic Thiem (Austria) 3,825
9. John Isner (United States) 3,425
10. Grigor Dimitrov (Bulgaria) 3,335.
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