Nico Roberg says Mercedes has no reason to feel nervous, despite finishing behind Ferrari on Friday in practice for this weekend's Chinese Grand Prix.

Rosberg was quickest in the first session at the Shanghai International Circuit, but dropped to third in the second, with the Ferraris of Kimi Raikkonen and Sebastian Vettel both going faster.

"There's no reason to be nervous just because Ferrari is quick," Rosberg told reporters, "and we don't know how much fuel Ferrari was running with.

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"We have to do our job properly, I'm happy with where we are but we know there's still time to come from the car."

Rosberg did concede, however, that Mercedes has had to do something different this weekend in order to protect the tyres.

"This circuit is very hard on the tyres, destroys the tyres really quick and we have [had] to go for a set-up that is completely different from what we are used to. That's why it's so difficult to find a good balance for this track," he explained.

Quizzed further on the two sessions, Rosberg added: "It was a complicated day because of the tyre situation, as I said before, making the search for the best possible set-up a difficult one. We're in for a tough weekend.

"I'm focused on what I have to do though, and I don't think there are any mind games going on. If it rains in qualifying that opens up the possibility of something unexpected happening but it will be the same for everybody.

"Ferrari was very quick so we'll have to have a good look at all the data overnight to try and find those extra hundreds of a second we're missing because it looks like we have a fight in our hands."

Meanwhile, Rosberg said he is not targeting his sixth win in succession on Sunday, more his third of the year.

"I'm not thinking I can win my sixth race in a row because last year was a long time ago, so I just think I won the first two races of the season and I want to win here too.

"But it won't be easy because Ferrari looks very quick [as I have already said], [and] Lewis too. Yes, he has a grid penalty, he'll have to start a bit further back on the grid but he can easily make up positions. I don't fear anyone in particular but I'm keeping my eye on all!"