Nico Rosberg believes that consistency is key to winning the world championship this season, as the German prepares for the Hungarian Grand Prix.

Rosberg has been involved in a constant battle with Mercedes teammate Lewis Hamilton this campaign, but remains ahead in the drivers' rankings by just 14 points.

Rosberg told reporters: "We each have strengths and weaknesses, which is normal.

"It is always going to be a tight battle and I just need to be a little more consistent than the other guy."

Hamilton is without a pole position during the last five races but holds a strong record at the Hungarian Grand Prix, winning four of the last seven.

Hamilton was fastest in the second practice on Friday.