F1 testing: Nico Rosberg on top on first day at Barcelona

Nico Rosberg narrowly edged out Kimi Raikkonen to put Mercedes on top on the first day of Formula 1 pre-season testing at Barcelona

F1 testing: Nico Rosberg on top on first day at Barcelona

Both men found improvements after bolting on Pirelli's medium-compound rubber in the final 20 minutes of the day.

Rosberg, whose morning had been disrupted by lengthy gearbox checks, was the first to make his move. New overall bests in the final two sectors produced a lap of 1m22.616s and vaulted him to the top of the timesheets.

Minutes later Raikkonen staged his own late rally, but despite bettering Rosberg's sector two time he fell seven thousandths of a second short of putting Lotus on top.

Fernando Alonso, again on mediums, was another late improver.

On his first day in the Ferrari F138 last year's championship runner-up worked his way down to a 1m22.952s to end the day in third.

The flurry of late improvements knocked morning pacesetter and reigning world champion Sebastian Vettel down to fourth.

The German had gradually improved his lunchtime best and was the first man to dip into the 1m22s bracket, only to be bumped down the order in theclosing stages.

Having launched its FW35 in the morning, Williams ended the day in fifth position courtesy of Pastor Maldonado, a racewinner at Barcelona last year.

The Venezuelan spent time at the top of the timesheets in the morning and racked up 85 laps in total, behind only Alonso in 110.

Daniel Ricciardo in the Toro Rosso STR8 shaded McLaren's Sergio Perez in the fight for sixth, while Paul di Resta - the day's third busiest man - was just two hundredths of a second down the road for Force India.

After bringing about the day's first red flag with an early out-of-fuel run, Esteban Gutierrez was ninth fastest and just over 2.5s off the overall pace for Sauber.

Charles Pic was the only other man to cause a stoppage, pulling to the inside of Renault due to a mechanical issue with his Caterham.

He dropped to 11th in the afternoon as Marussia's Max Chilton found improvements with the soft tyre.

Tuesday times:
Pos Driver Team Time Laps Tyre* 1. Nico Rosberg Mercedes 1m22.616s 54 Medium 2. Kimi Raikkonen Lotus 1m22.672s + 0.007s 44 Medium 3. Fernando Alonso Ferrari 1m22.952s + 0.336s 110 Medium 4. Sebastian Vettel Red Bull 1m22.965s + 0.349s 66 Medium 5. Pastor Maldonado Williams 1m23.733s + 1.117s 86 Soft 6. Daniel Ricciardo Toro Rosso 1m23.884s + 1.268s 73 Hard 7. Sergio Perez McLaren 1m24.124s + 1.508s 77 Medium 8. Paul di Resta Force India 1m24.144s + 1.528s 82 Medium 9. Esteban Gutierrez Sauber 1m25.124s + 2.508s 68 Hard 10. Max Chilton Marussia 1m26.747s + 4.131s 65 Soft 11. Charles Pic Caterham 1m27.534s + 4.918s 49 Hard * Compound on which fastest lap was set 
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Series Formula 1
Drivers Nico Rosberg
Author Sam Tremayne
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