Mercedes' Toto Wolff has revealed Lewis Hamilton and Nico Rosberg are "like enemies competing for the world title".

The team-mates have had a number of flashpoints in 2014, most notably during the Belgian Grand Prix after Rosberg crashed into Hamilton's car.

Team boss Wolff said: "It changed from an almost amicable relationship to a very intense moment where it was almost like realising these two are enemies."

German Rosberg currently leads Briton Hamilton by 22 points.