Mercedes’ team principal Toto Wolff said he is concerned about the pace of rivals Red Bull in Singapore.
Both Red Bulls finished the second practice session ahead of the two Mercedes drivers.
“We are not happy with the performance today,” said Wolff during today’s FIA press conference. “We haven’t really made the tyre work in a way we should on the one-lap performance, and on the long runs either.”
“We’ve seen some spectacular laps from the Red Bulls. Just need to get our heads together and assess what’s happening.”
However Daniel Ricciardo is sure Mercedes and Ferrari have kept some of their performance in hand.
“Both free practices today were good for us,” he said. “We hit a bit of traffic on the [super-soft tyre] lap, but we know what we have and I think we are looking good for the weekend.”
“We expect the silver cars and the red ones to turn it up tomorrow,” he added, “but hopefully we can keep the pace we showed to get up as far the grid as possible.”
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