Nico Rosberg is confident ahead of the German Grand Prix after he clocked the fastest time in practice on Friday.

The 29-year-old edged ahead of teammate Lewis Hamilton in practice and insists that he is enjoying the challenge as the pair battle for the drivers' championship title.

Rosberg told reporters: "I go to every race with the belief in my head that I can win,

"I am here to win and believe I can if I put things together. It's always a challenge against Lewis".

Rosberg topped the practice charts on Friday, while Hamilton followed his teammate ahead of Fernando Alonso and Daniel Ricciardo.