Nico Rosberg says "some of the other teams are closer" to Mercedes following practice for the Belgian Grand Prix.

The Mercedes pair of Rosberg and Lewis Hamilton were quickest in the two practice sessions on Friday, with Fernando Alonso the closest challenger on both occasions. However, with Williams also well suited to the Spa-Francorchamps circuit, Rosberg admitted he is wary of Mercedes' advantage being reduced in Belgium.

"It's really great to be back at Spa," Rosberg said. "It's a fantastic track, the flow of the circuit is great and driving Eau Rouge is tricky this year with less downforce. You need to be really precise, and with worn tyres it was tough to take this unique corner flat out. It looks like we have the quickest car again, but it's a bit different here than at some other tracks. It seems that some of the other teams are closer and we need to work a bit on our speed down the straights.

Related Articles

And Rosberg called on Mercedes to make sure it maximises the potential of its car in qualifying on Saturday.

"As normal, it will be a long night analysing everything that we learned today to really nail it tomorrow. The interesting challenge for this weekend is to find the right compromise between being quick over one lap and over a long distance in the race - especially if it's wet tomorrow, with the predictions currently saying we will have mixed conditions."