Mercedes' faltering rivals have hailed the world champions' new car as 'unbelievably quick' with the Silver Arrows' domination of F1 set to continue at the start of the 2015 season. Nico Rosberg's lap of 1:22.792 set on Friday at Barcelona when the W06 ran with soft tyres for the first time this winter was in excess of half a second clear of the field's previous best effort, recorded by Felipe Massa's Williams on the first day of the final pre-season test at the Circuit de Catalunya. Every race, qualifying and practice live on Sky Sports. 'They are unbelievably quick,' acknowledged McLaren's Jenson Button. 'It is all a guessing game and the only thing you can look at are the long runs and...
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