Both Felipe Massa and Valtteri Bottas were left surprised by their pace in FP2 after struggling to improve significantly on the supersoft tyre.

The two drivers finished the second practice session for the Singapore Grand Prix in 17th and 18th places respectively and well off the ultimate pace having not improved as much as the other teams on the option compound. Massa said more pace will be possible from the tyres if he manages to solve issues with his car but says the team is set for a tough race if it can't improve.

"It's a really difficult night for us," Massa said. "We couldn't find the right balance, the right grip, especially on the rear of the car. So there is a lot that we need to do to improve the car for tomorrow. For sure we expect better than how it was today so I hope we find the problem otherwise it will be a very difficult weekend.

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"There's a huge difference between prime and soft but we were the team that improved less from one tyre to the other one. So it's in the middle of the problem that we have in the car. For sure if we find something the difference will be better for us as well.

"I expected it would be better but I still believe that we have some problems that we need to find."

And team-mate Bottas said any issues were not glaringly obvious, but agreed with Massa that both cars were struggling in the same way.

"There were no real problems really, just some issues with the balance," Bottas said. "The car didn't feel very good from the beginning and the whole day we struggled a bit, especially with the rear end of the car. I think the main thing for us that we need to work on is to get more lap time from the option against the prime because we only improved half a second and other teams improved 1.5 or 2 seconds so there is plenty of work to do."