Sauber drivers Felipe Nasr and Marcus Ericsson are expecting their performance level to vary over the summer depending on the tracks.

The Swiss outfit's machines appear to suffer on high-downforce layouts, like Barcelona last weekend. Consequently, the squad will attempt to make the most of the next two races in Monaco and Montreal, where the Sauber's efficient traction could boost its chances for points.

"We knew Barcelona would not suit us as it requires good downforce," commented Marcus Ericsson. "And as the other teams bring on their upgrades, we expected to be less competitive than Toro Rosso for example. On this type of track, we will undoubtedly struggle this year."

Brazilian rookie Felipe Nasr has acquitted himself well since the start of the season, finishing fifth in Australia and scoring more points for Sauber in China as the 22-year-old pursues his apprenticeship at the highest level.

"From my point of view, I took the maximum out of the car," Nasr said after the Spanish Grand Prix. "I think I capitalised well in the early races to score as much as possible when I had the opportunity."

Although it has benefitted from a much improved Ferrari engine, Sauber has struggled to make ends meet this year, its limited budget further burdened by a payout ordered by the courts in Australia to compensate Giedo van der Garde for the failure to complete the Dutchman's contract.

Therefore, development and upgrades may prove few and far between in the coming months with the team not expecting any major changes to its C34 car before the mid-season.

Click here for Wednesday's gallery from testing at the Circuit de Catalunya

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Phillip van Osten

Motor racing was a backdrop from the outset in Phillip van Osten's life. Born in Southern California, Phillip grew up with the sights and sounds of fast cars thanks to his father, Dick van Osten, an editor and writer for Auto Speed and Sport and Motor Trend. Phillip's passion for racing grew even more when his family moved to Europe and he became acquainted with the extraordinary world of Grand Prix racing. He was an early contributor to the monthly French F1i Magazine, often providing a historic or business perspective on Formula 1's affairs. In 2012, he co-authored along with fellow journalist Pierre Van Vliet the English-language adaptation of a limited edition book devoted to the great Belgian driver Jacky Ickx. He also authored "The American Legacy in Formula 1", a book which recounts the trials and tribulations of American drivers in Grand Prix racing. Phillip is also a commentator for Belgian broadcaster Be.TV for the US Indycar series.

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