Nico Rosberg finished fastest during the final practice session ahead of Sunday's Singapore Grand Prix, having edged out Max Verstappen by just six hundreths of a second.
The Mercedes driver kept his position at the top of the practice sessions after claiming top spot on Saturday with a time of 1:44.352, but with Red Bull's Verstappen coming so close qualifying could now prove to be a tight affair.
Elsewhere in the running, a packed grid late on prevented Lewis Hamilton from stealing in another practice lap, leaving the Mercedes man to settle for P8 at 1:45.806 after a mistake-laden session.
Qualifying is due to begin at 2pm UK time.
Full standings:
1. Nico Rosberg (Mercedes)
2. Max Verstappen (Red Bull)
3. Kimi Raikkonen (Ferrari)
4. Daniel Ricciardo (Red Bull)
5. Sebastian Vettel (Ferrari)
6. Nico Hulkenberg (Force India)
7. Daniil Kvyat (Toro Rosso)
8. Lewis Hamilton (Mercedes)
9. Carlos Sainz (Toro Rosso)
10. Valtteri Bottas (Williams)
11. Sergio Perez (Force India)
12. Fernando Alonso (McLaren)
13. Esteban Gutierrez (Haas F1)
14. Felipe Massa (Williams)
15. Kevin Magnussen (Renault)
16. Jenson Button (McLaren)
17. Felipe Nasr (Sauber)
18. Romain Grosjean (Haas F1)
19. Marcus Ericsson (Sauber)
20. Jolyon Palmer (Renault)
21. Pascal Wehrlein (Manor)
22. Esteban Ocon (Manor)
