Felipe Massa says Williams immediately found a way of solving its tyre issues which had plagued the team during Friday practice, allowing it to be competitive in qualifying in Singapore.

After both cars were well off the pace on Friday, Massa admitted that Williams was set for a tough weekend if it didn't find the cause of its tyre problems. However, having pinpointed overheating tyres, Massa said the team was quickly able to make progress in FP3 and qualifying.

"Honestly, straight away after FP2 our guys were pretty sure what the problem was," Massa said. "It was clear that our tyres were too hot, so I was two tenths slower in the first sector - which was fine - and then I was nine tenths slower in the second and nine tenths slower in the third, so you could see that after a few corners the tyres just go away.

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"The long run was very difficult as well because it was just using the rear tyres too much. For sure we found the problem; it was actually some specification which we were thinking was the right one for this track. It wasn't the right one so we changed it and found the problem."

Having set the provisional pole position time on his first run in Q3, Massa said he knew he was never likely to stay there having put together an almost perfect lap.

"After FP3 we were sure that we were where we expected to be. I think qualifying was good, we were there fighting and it was good. Then Q3 was a pretty big fight. When I saw that I was first after the first try ... I did a very good lap straight away, so I don't think I had a lot to improve afterwards. I just lost some positions but I think it was positive for us anyway.

"We did a good qualifying and it's not the best track for us so we are just a few tenths slower and I think that's OK. I still believe that we can do a good race tomorrow. The race is very difficult tomorrow; just to finish is not easy but we'll try everything we can."

And Massa admitted that Williams now has a question mark over its strategy having changed the way it uses its tyres so much since FP2's race simulation.

"I think so, but it should be better anyway. The biggest problem yesterday was the tyre temperature. It should be better in the race compared to yesterday so I hope it's enough to do a good pace.

"The strategy yesterday after our long run it was clearly three stops but now it's on the [line] between two and three. We'll see what will be the best especially with how the car behaves in the first stint."