Nico Rosberg says there is still much work to be done on the set-up of his Mercedes despite both himself and Lewis Hamilton dominating proceedings once more during Friday practice for the Spanish Grand Prix.

The German endured a fraught day around the Circuit de Catalunya when an ERS cooling system issue restricted him to just nine laps, which was only good enough for fifth on the grid.

Bouncing back in FP2, Rosberg was second fastest, four tenths behind his team-mate Lewis Hamilton but a substantial six tenths up on the chasing pack.

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Indeed, despite his positive position, a somewhat downbeat Rosberg was disappointed with his day in the car and the gap to his team-mate, admitting he hasn't found a comfortable set-up as yet.

"The team have done a great job during the short break that we have had since China. We have brought some new upgrade parts here to Barcelona this weekend and they are working quite well on the car. It looks like we are very quick again, however, personally I didn't feel very comfortable in the car today, especially as I had limited running in P1. We still have a lot of work to do tonight.

"At the moment we are running behind a little bit and I haven't found my way with set-up so that is what I am trying to get my head around.

"It's a whole different situation out there again. Every time I go out there, I have to adapt to circumstances again and find my way all over again with the set-up and optimise it again for the conditions of the track. It is a constant process every weekend, we just haven't gotten there yet."