Daniil Kvyat says it is too early to tell whether Red Bull can mount a significant challenge towards Mercedes in the Singapore Grand Prix despite emerging as the surprise front runner of the first day of action around the Marina Bay Circuit.

With Mercedes seemingly struggling to get the best from the super-soft tyres, Kvyat rose to the fore in the Red Bull as the former title-winning team enjoyed easily its best start to a race weekend this year.

Indeed, given Kvyat missed much of the FP1 session due to fuel system issues, he was surprised to bounce back so comprehensively in FP2. However, he remains wary of Mercedes' true potential, saying only qualifying will provide the definitive gauge of competitiveness.

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"We knew on this track we had a bit more of a chance but we don't know what Mercedes was doing today," he said. "We just have to wait until tomorrow. We did our job and we ended up P1 so let's see what other people do tomorrow.

"I felt everything was OK with the car, especially considering I missed completely almost FP1 so it was quite good value for FP2.

Having struggled to get the best from the Red Bull in qualifying, Kvyat says his target is to now build on his first ever session-topping performance in F1 when it matters.

"The feeling is improving every time, but I still haven't had a great Saturday so far this year and I'm trying to work on that and let's see what I make out of it tomorrow."