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Nico Rosberg continued from where he left off at last weekend's Spanish Grand Prix by proving quickest on the first day of F1 testing at the Circuit de Catalunya.
Following his lights-to-flag win from pole position on Sunday, Rosberg returned to the cockpit of the Mercedes W06 to continue building on the car's development, as well as participate in two hours of Pirelli tyre testing.
It was during this test with the unmarked rubber that Rosberg set his fastest time, a 1min 24.374secs lap, which proved three-tenths better than his pole-winning lap from Saturday, albeit still 1.6secs slower than his benchmark from pre-season testing. As he had in pre-season, the German covered a massive distance during the day, completing 146 laps in all.
On a day that saw a mix of regular race drivers and development drivers participate in the first of two in-season tests this year, Marcus Ericsson leapt up the order in the afternoon to go second quickest for Sauber, the Swede's 1m 26.624s lap proving considerably quicker than his qualifying effort from the weekend, but 2.2secs off Rosberg.
From Sauber to GP2 to Ferrari, Raffaele Marciello got to sample the SF15-T for the first time, completing 125 laps en route
to a third fastest time of 1m 26.648s, while Daniil Kvyat and Pastor Maldonado completed the top five for Red Bull and Lotus with laps of 1m 26.904s and 1m 27.338s respectively.
Making their F1 test debuts for Force India and Toro Rosso, Nick Yelloly and Pierre Gasly followed up in sixth and seventh, the Briton particularly impressing with a 1m 27.386s time that would have qualified him ahead of Nico Hulkenberg and Sergio Perez during the race weekend. Gasly, meanwhile, suffered a stop in the very final minute at turn four, but will be back in action tomorrow, this time at the wheel of the Red Bull.
Having spent the day working on aero for Williams, Felipe Massa completed his day early with the eighth-fastest time, while Oliver Turvey brought up the rear in the McLaren-Honda MP4-30, completing 68 laps as the team worked on aero and solutions for the upcoming races.