Mercedes still unsure of true form

Ross Brawn thinks it is too early to say whether Mercedes can deliver more victories this season, despite the nature of Nico Rosberg's dominant performance in the Chinese Grand Prix. Rosberg was in a class of his own in Shanghai, as he finished well clear of his opposition for his maiden Formula 1 win. But despite the performance, Mercedes team principal Brawn thinks the uncertainty caused by tyre characteristics this year means he has to be cautious about his outfit's chances going forward.

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