World Championship leader Sebastian Vettel has labelled Mercedes the 'clear favourites' ahead of the fourth round in Sochi. The Silver Arrows have won every race since the Russian Grand Prix was finally added to the calendar in 2014, with Lewis Hamilton claiming back-to-back successes before the now retired Nico Rosberg won in Sochi 12 months ago. And Vettel believes it is that strong record that will make them difficult to beat this weekend, despite Ferrari clearly having the pace to trouble Mercedes. 'On paper Mercedes is the clear favourite, as the Sochi track is a circuit made for Mercedes,' Vettel told the official Formula 1 website. 'The closer we can get the better. So let’s...
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