Nico Rosberg is confident Mercedes is on target with its new car after completing 97 laps on what he described as a "great day" of testing at Jerez.

Lewis Hamilton was first out on track on the opening day but saw his encouraging early running curtailed by a front wing failure. However, Mercedes recovered on Wednesday - despite a slow start to the morning - to complete the most laps while the likes of Red Bull struggled with power unit issues.

Asked how he felt when looking at the plight of other teams in the pit lane, Rosberg was keen to focus on Mercedes but is happy with the early signs.

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"I don't know about comparing to other people," Rosberg said. "It is just one day that went well for us. Yesterday went poorly for us, so you need to be careful. But I can look at ourselves and say we're on target, with the amount of kilometres we were able to do."

Following the front wing issue for Hamilton on Tuesday, Rosberg had praise for the way Mercedes had responded as a team.

"Yesterday it went a bit wrong with Lewis having a shunt due to a technical problem. But they flew the bits out overnight, fixed them, so thanks to all of you who were up all night back in England for fixing that front wing and everything, getting it on the car.

"We've had such a great day - we just drove and drove, doing loads of laps and that's what we need at the moment. That's how you get rid of the reliability problems, try to understand things better, so it has been a very positive day."

Rosberg also said the key to translating the encouraging start in to a successful season would lie in amassing as much track time as possible.

"We have to push on getting the miles in and trying to get rid of all the reliability problems to get to the finish line in the first couple of races. At the same time trying to improve our actual speed. With a day like today we're on track."