Lewis Hamilton says it is possible rivals Red Bull and Ferrari could well have the edge on Mercedes heading into qualifying for the Singapore Grand Prix after enduring an unusually lacklustre opening day around the Marina Bay Circuit.

Though Mercedes assumed its familiar 1-2 positions in FP1, it faced stronger competition from Red Bull and Ferrari during FP2, Hamilton ending the session in fourth place, while Nico Rosberg was further back in seventh position.

Though rivals suspect Mercedes has more pace in its pocket for qualifying, Hamilton was rather more cynical about Mercedes' true pace, saying he suffered with no issues and that others were simply faster.

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"No problems at all, they are just fast," he said. "This is always a race where people are closer and the gap is always closer. They are even closer this weekend and potentially even ahead.

"We are just doing what we are doing and not targeting anything specifically here. We are just pushing as hard as we can to be as fast as we can. The others are looking quite quick but tomorrow is another day."

Indeed, with Hamilton concerned about tyre degradation on longer runs, he is also worried he may face a challenge for pole position too. Despite this, he says he welcomes the competition.

"Definitely we have a genuine challenge from these guys. I'm looking forward to seeing what happens, it's going to be interesting that's for sure. Ferrari is very fast or equally as fast and Red Bull are quite competitive looking at the times, but we will still be fighting."