Felipe Massa says he is preparing to take advantage of any mistakes made by the Mercedes pair of Nico Rosberg or Lewis Hamilton, suggesting he could have a major say in the title race.

The Williams driver ended free practice two in tenth place after struggling with the setup of his car for this weekend but the Brazilian is more optimistic his Williams will be towards the front of the grid on Sunday.

Indeed, though Massa explains he isn't confident of catching either Mercedes car on raw pace, with the drivers' championship going down to the wire, he is aware the pressure could force an error from either driver. It is a scenario Massa is keen to capitalise on.

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"The Mercedes team have been in another world for the whole championship," Massa said. "So looking at their pace it won't be easy for us on the track. If we have any opportunity to be there we will try our best.

"Mistakes are something we need to be ready for from Mercedes so if we have that opportunity to be in front because of a mistake or something else, it will be welcomed by us."

Hamilton finished the day on top with a 1:42:113, 0.083s ahead of his team-mate, and the Williams man says he believes the Englishman is best placed to seal the title.

"When you see how strong both the Mercedes are you have to look at who has more points. Lewis has more chance for the title because he has more points."

Massa, who sits eighth in the championship, comes into the race with the potential to leapfrog McLaren driver Jenson Button for seventh. The Brazilian is just eight points behind with double points up for grabs this weekend in the final race.