Sauber heads to the first European round of the season in Spain looking to maintain its positive run of form during the opening flyaways.

The Swiss team, which failed to score a single point in 2014, has enjoyed a strong start to 2015 with Felipe Nasr and Marcus Ericsson at the wheel, scoring 12 points from the opening four races to leave it fifth in the constructors' standings.

However, with rival teams set to use the Spanish Grand Prix as a chance to bring upgrades to their cars, Head of Track Engineering Giampaolo Dall'Ara says it is now up to Sauber to maintain its momentum heading into the European leg of the season.

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"After an encouraging pre-season campaign at the Circuit de Catalunya, we head back there with some solid race achievements and aerodynamic upgrades," he said. "The first European race is known for a number of teams introducing improvements to their cars, therefore it will be important for us to keep up momentum and fight for points.

"We are aware that the conditions will be fairly different to how they were two months ago, and, therefore, some set-up adjustments will be needed to get the medium and hard tyres to work at their best in warmer temperatures."

Ericsson and test driver Raffaele Marciello will remain in Spain for post-race testing, where a focus will be paid to aerodynamics, braking and suspension.