Nico Rosberg says he is eager to get his 2013 campaign underway in earnest this weekend in Bahrain after a troubled start to his F1 title challenge.

The German has failed to finish two of the opening three races, with an electrical issue putting him out of the season opener in Australia and suspension trouble causing him to pull back into the garage in China.

It means Rosberg has managed just twelve points thus far to sit down in seventh in the championship standings and he said he was hopeful of an improvement in his luck this weekend at the Sakhir circuit.

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"I'll be really happy to get back in the car again on Friday after a tough weekend in Shanghai," he admitted. "The first three races haven't quite worked out as we had hoped on my side but the positive is that we have a car that we can really work with. So I'm looking forward to getting on with this weekend and the circuit at Sakhir is one that I like very much.

"It's going to be very tough on the rear tyres and our biggest challenge will be to make the most out of the situation. We're better prepared than we were last year and we have shown that the car is much stronger so I really hope that we can achieve a great result in Bahrain."

Two podium finishes, and a pole position, for team-mate Lewis Hamilton have shown the pace within the F1 W04 but Mercedes motorsport boss Toto Wolff admitted that the results on Rosberg's side of the garage were an indication of the improvements that still need to be made.

"After three races, we have an equal balance of reasons to be pleased and areas we need to improve," he said. "Two podium finishes in two races for Lewis represent a strong start to the season. That shows our car is competitive in different conditions and on different types of circuit. But two technical retirements for Nico in three races are not acceptable, and everybody is working flat out at the factory to make sure we hit our target of bringing both cars to the finish at every race.

"Inside the team, the atmosphere is calm and motivated, with Nico and Lewis pushing everybody forward with their strong performances. Bahrain will provide another new challenge, with the combination of high temperatures, dust conditions and heavy demands on the rear tyres. We will need a smooth and reliable weekend to collect the required data for making the right decisions on Sunday."