Nico Rosberg cannot wait to get part two of the 2015 F1 season underway as he attempts to close the gap on Mercedes team-mate Lewis Hamilton both on and off the track.

Unlike last season, the German has had to play second fiddle to the reigning world champion over the opening four races, finishing at least one place adrift of Hamilton each time. With Ferrari offering an improved challenge to the Silver Arrows, Rosberg is also having to keep one eye on his mirrors for both Sebastian Vettel - who upset the Mercedes applecart in Malaysia - and Kimi Raikkonen, who split the expected frontrunners last time out in Bahrain.

Qualifying, a strength last season, has been Rosberg's weakness in 2015, with Hamilton already leading the Pole Position Trophy standings 4-0 over the field, and the German heads into this weekend's Spanish Grand Prix - the first race for three weeks and the first on European soil this season - some 27 points behind his team-mate in the drivers' standings, having only overhauled Vettel for P2 in Sakhir.

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Despite a brake issue slowing him at the end, however, Rosberg's form in Bahrain was his best of the season so far, and he is keen to build on that when the pit-lane opens on Friday morning.

"The race in Bahrain was definitely the most enjoyable of the season for me so far," the German confirmed, "It was a really good fight out there and it gave me the chance to show what I can do in a close battle.

"Although we had a problem at the end, the car felt fantastic and I could really push hard to get my positions back. It's felt like a long break and I can't wait to get back out there in Barcelona. It's the first race in Europe, at a track which every driver knows well, so it should make for an exciting weekend. I'm feeling really fired up for the next races knowing I have all the tools available to me for a strong performance."

The Spanish Grand Prix has traditionally witnessed the first big technical update from the teams and, despite almost every entrant having trickled new parts onto their cars over the opening four races, Rosberg is keen to see what tricks Mercedes has to keep it ahead of its rivals.

"The circuit itself really tests every element of the car - especially the aero - so it will be interesting to see how each team has developed since we last came here in the winter - and also to see who has brought the most upgrades since the last race," he said, "I know our guys have been working mega hard at the factory, so let's see what we've got!"