Felipe Massa and Valtteri Bottas admit the Singapore Grand Prix could pose a challenge for the Williams team based on its performance at comparable circuits in 2015.

One of only two true street circuits on the calendar alongside Monaco, though the Marina Bay venue represents a more variable challenge than the Monte Carlo race, Williams' failure to score in that race gives the drivers cause for concern coming to Singapore.

Nonetheless, though Monza podium winner Massa accepts Singapore is probably the 'worst' race for Williams out of the final seven events, he still expects to be challenging well inside the top ten.

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"It's not easy to get the set-up perfect and the tyres working in the ideal operating window, and these are challenges we will face from the start of the first session. Of the last remaining races this season this is probably the hardest track for our car, but that doesn't mean we can't deliver a good haul of points."

It's a sentiment shared by team-mate Bottas, saying the number of corners - 23 in total - will prove a challenge in terms of getting the Williams balanced.

"For the team it's a challenging track as there are so many corners with different characteristics which makes it hard to get the balance perfect. The heat, humidity and intensity of the track also makes it very physically demanding. There have been a few changes to the track layout this year so it will be interesting to see the effects these have."