Rosberg confident of ?significant? step

Mercedes GP can target a 'significant' step forward in form for this weekend's Spanish Grand Prix on the back of a raft of updates to the car, reckons Nico Rosberg.

Source: http://www.iracing.com/inracingnews/formula-one-news/f1-formula-one-news/rosberg-confident-of-significant-step/

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