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Singapore - Red Bull's Max Verstappen and Daniel Ricciardo set the fastest times and Nico Rosberg crashed out of an eventful Singapore Grand Prix first practice session on Friday.
As day turned into night over the tropical city state, teenager Verstappen lapped the 5.065km Marina Bay circuit in 1min45:823sec, 0.049 sec ahead of his Australian team mate.
Sebastian Vettel, the winner here last year, was third quickest in his Ferrari with championship leader Hamilton only managing fourth, 0.603 seconds slower than Verstappen.
READ: Ricciardo says he'll perform a 'shoey' if he wins in Singapore
Rosberg, who has closed the gap to two points behind his team mate at the top of the world championship, was trying to improve on his best time of 1:46.513 when he locked his brakes on turn 18.
Glowing brakes
Rosberg had to take his hands off the wheel as his Mercedes, with brake discs glowing red hot under the floodlights, careered straight into the barriers.
He managed to extricate his car, minus its front wing, and limp back to the pits with his session ending 15 minutes prematurely.
Mercedes failed to make the podium at Singapore a year ago as Ferrari and Red Bull dominated with their extra mechanical grip negating the Silver Arrows' power advantage.
READ: F1: Three teams target Singapore GP win
Hamilton retired in 2015 after qualifying only fifth and Friday he was complaining over team radio of fierce heat in his car's footwell.
Hamilton reported: "Very hot down by my right ankle. Very, very hot."
Rosberg wasn't the only driver to dice with danger on the twisty street circuit as the track temperature fell after sunset.
Vettel took a chunk out of the wall at turn 21 with the right rear wheel of his Ferrari but was able to report only "cosmetic damage" back to his pit team.
Outside the top 10
McLaren's Fernando Alonso and Sauber's Felipe Nasr were among several drivers who later made the hole in the yellow paint bigger at the same spot.
Jenson Button's practice almost ended before it started on his first out-lap when a software gremlin caused his engine to cut out.
His McLaren was close enough to the pit entrance, however, to be pushed to the garage by marshals and he later emerged to set the 16th fastest time of 1:49.615.
Romain Grosjean was the only driver who failed to get on track in the session.
A leak in the engine of his Haas instead leaving the Frenchman to while away the 90 minutes of the session playing cards in the team hospitality unit with one of his crew.
FP1 times
1. Max Verstappen (NED) Red Bull 1min45:823
2. Daniel Ricciardo (AUS) Red Bull 1min45:872
3. Sebastian Vettel (GER) Ferrari 1min46:287
4. Lewis Hamilton (GBR) Mercedes 1min46:426
5. Nico Rosberg (GER) Mercedes 1min46:513
6. Kimi Raikkonen (FIN) Ferrari 1min46:890
7. Carlos Sainz Jr (ESP) Toro Rosso 1min46:936
8. Daniil Kvyat (RUS) Toro Rosso 1min47:683
9. Felipe Massa (BRA) Williams 1min48:044
10. Esteban Gutierrez (MEX) Haas 1min48:109
11. Fernando Alonso (ESP) McLaren 1min48:202
12. Sergio Perez (MEX) Force India 1min48:214
13. Nico Hulkenberg (GER) Force India 1min48:359
14. Valtteri Bottas (FIN) Williams 1min48:453
15. Felipe Nasr (BRA) Sauber 1min49:595
16. Jenson Button (GBR) McLaren 1min49:615
17. Jolyon Palmer (GBR) Renault 1min49:794
18. Kevin Magnussen (DEN) Renault 1min50:263
19. Pascal Wehrlein (GER) Manor 1min51:112
20. Marcus Ericsson (SWE) Sauber 1min51:479
21. Esteban Ocon (FRA) Manor 1min52:379
22. Romain Grosjean (FRA) Haas