Rosberg says Hamilton will not break him 'mentally' despite four consecutive GP wins

Mercedes driver Nico Rosberg has said that his teammate Lewis Hamilton will not be able to break him down mentally despite the Brit racer's fourth consecutive win in this Formula One season.

Rosberg, who finished in second place after Hamilton at the Spanish Grand Prix, said that his teammate has the momentum and there is no way round that, but added that he has to try to break it.

According to the BBC, Hamilton has won for the fourth time in a row with Sunday's Spanish Grand Prix and is in close battle for the championship with Rosberg, who has struggled to overtake the 2008 world champion since winning in the season opener at Australia.

Mercedes has reportedly allowed Hamilton and Rosberg to race freely for victory and the two drivers say that they can maintain a good relationship despite admitting that the 'tension' of their fight is high.

Rosberg said that the advantage they have of competing with each other is that they have done it before, when they were 14 and used to race as karting teammates for the title.