Robert Kubica says he is taking nothing for granted heading into the Singapore Grand Prix this weekend after admitting that the event will be one of the hardest of the year.

Kubica impressed on the streets of Monaco earlier in the year, which has led people to suggest that he could be one of the men to beat in the annual F1 race under lights.

However, the Renault man admitted that he wasn't getting too carried away heading to the Singapore streets given the way in which the sport has moved on since Monaco back in May.

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"I think we must be careful not to take anything for granted," he said. "It's true that Singapore is the closest circuit to Monaco in the calendar, but Monaco was over four months ago.

"I'd like the car to be as competitive and easy to drive as it was back then, because it makes it easy for me to push straight away and easier for the engineers to work on extracting the final bit of performance. But things change quickly in Formula 1 and it may not be the case.

"My approach will be as usual: I will keep in mind that we are fighting in a very strong pack of cars, and lately teams like Williams have come very strong, so we need to wait and see. But I'm definitely looking forward to a good performance."

While Kubica admits that Singapore will be one of the hardest races of the year, team-mate Vitaly Petrov said he was looking forward to the challenge of racing under lights for the first time in F1 as he starts a run of five new circuits to finish the season.

"It will be a new challenge for me," he said. "I don't know these circuits at all so I will do the maximum to prepare for them. I have been watching videos of previous races and reading data. We also hope that our car will be much more competitive in Singapore and for the last few races.

"I look forward to racing there and to the challenge that lies ahead. There are a lot of difficult corners in Singapore and, from what I saw in the videos, the track is bumpy, the car is jumping a lot and it looks easy to lock the wheels. I have experience of racing at night because I took part in the GP2 Series night race in Qatar. So the night race won't be a problem for me."