Nico Rosberg says the reason he finished Friday practice for the Singapore Grand Prix down in seventh, was because he went the "wrong way" with the set-up.

Rosberg had been quickest in the opening session at the Marina Bay Circuit, 0.319s up on Mercedes team-mate, Lewis Hamilton.

However, he slipped back in FP2, only managing a 1m 46.781s - which left him 0.639s off pace setter Daniil Kvyat and 0.302s off Hamilton.

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"No, I went the wrong way," Rosberg confirmed, when asked if he made progress with his set-up during FP1 and FP2.

"But I learnt a lot and it will be okay to get it right for tomorrow."

"We didn't do a good job today and the others have been pretty quick, so it is both coming together," he added, when quizzed on why Mercedes didn't look so dominant.

As for if he relishes the challenge from Ferrari and Red Bull, he replied: "Not really, no - I prefer to be out in front, but they have been quick today.

"It looks like it is going to be Ferrari, Red Bull and us in a battle."

Meanwhile, Rosberg predicted that tyre degradation will be critical in the race on Sunday: "Tyre wear is quite high, so it is quite difficult to do a two stop and that is going to be the key to the race. That is what we need to work on tonight as well," he concluded.