errari driver Sebastian Vettel reckons Mercedes will up its pace as the Russian Grand Prix weekend develops, after the team's low-key first day at Sochi Autodrom.Vettel led team-mate Räikkönen in a Ferrari one-two during Friday's second practice session, over half a second clear of the Mercedes drivers, the Scuderia also looking strong in race-trim.Asked if he felt Mercedes sandbagged its way through practice, Vettel responded: "Yeah, I think they will be fine; it's a circuit that suits them, so they will be strong tomorrow."Last year people expected Williams to be fastest after the Friday, if I remember right, and it turned out that Mercedes was the fastest, so that's how...
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