Nico Rosberg has admitted that it will be difficult for him to win tomorrow's race at the Bahrain Grand Prix.

The Mercedes driver will start from the front of the grid after setting the fastest time in qualifying earlier today.

The 27-year-old told reporters: "We worked really well last night to improve the car because on Friday we were really struggling and the result is just fantastic.

"It is going to be a tough race with rear degradation. For sure the completion is going to be tough and it's difficult to say if we have enough pace to win the race but a lot can still happen.

"The first three races have been a really rough and today was the first normal qualifying so I just want to kick-start my season in the race."

Rosberg's only previous pole position was at last year's Chinese Grand Prix, which he went on to win.