Rosberg admits he has to regain momentum in F1 title fight

The German won the season-opening Australian Grand Prix while his Mercedes team-mate retired, but Hamilton's run of three victories means he is now only four points ahead.

"Every weekend is crucial, but yes, the result momentum is on his side at the moment and I need to turn it around," said Rosberg.

"I am here to win and to try and extend the lead in the championship."

Rosberg does not believe he needs to make any significant changes to his approach.

Instead, he pointed to not having smooth weekends recently to ending up behind Hamilton in the last three races.

"I am definitely comfortable to keep on doing what I am doing," he said when asked by AUTOSPORT if he needs to do anything differently to turn things around.

"What I need is a normal weekend, I haven't had one of those lately.

"I just need a normal weekend and I am sure I will be able to turn things around.

"In China, there were many [complications] the whole weekend so it really was a damage limitation weekend for me and with second place it was the perfect damage limitation.

"So I just look forward to a weekend without too many complications and then I am sure I will be a lot stronger."

While Rosberg and Hamilton head into the weekend as clear favourites, the track configuration in Spain could mean the opposition is closer than it has been previously.

Not only are all teams planning significant car upgrade packages, but the track configuration might also mean the Mercedes engine advantage is not as big as it has been.

"I expect people to be a bit closer here at this track because there has been time to develop and also because engine power is that little bit less important here than it was in China," said Rosberg.

"I hope that we have pushed on with development also a lot and that we are able to keep our gap but we have to wait and see."