Barcelona could be a downward turning point in Sauber's 2015 Formula 1 world championship campaign, driver Felipe Nasr has revealed. Having struggled financially through 2014 and then fended off Giedo van der Garde's legal advances in Australia, the Swiss team has surprised so far this season with its pace and results. And Brazilian rookie Nasr, 22, has been the star, delivering most of the points that have powered Sauber to fifth in the constructors' standings. But after returning to his home city of Brasilia in the lull before the start of the European season, Nasr warns that Sauber may struggle to keep up its top form. 'Barcelona will be a big turning point for the teams,' he is quoted...
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