Barcelona day four - Mercedes ahead as pre-season testing ends

Mercedes again led the way in Barcelona on Sunday, as the final winter test drew to a close. With the cars next due on track in opening practice for the season-opening Grand Prix in Australia in two weeks' time, Nico Rosberg was the man on top. Rosberg led the way from Ferrari's Fernando Alonso and McLaren's Jenson Button, with Sauber's Nico Hulkenberg, Lotus's Kimi Raikkonen and Force India's Paul di Resta completing the top six

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