Lewis Hamilton believes that Nico Rosberg will be tough to beat in the Spanish Grand Prix this weekend.

The defending world champion has won three of the first four races this season, but he expects his Mercedes teammate, Sebastian Vettel and Kimi Raikkonen to push him hard.

He told BBC Sport: "I expect it to be a close fight with Nico and the Ferraris this weekend, but I think the car will be strong. This is the race where everyone tends to bring a big upgrade package, and we certainly have some new parts on our car.

"I have been really happy with the way I am driving and the results have been flowing as well. Particularly the last two races in China and Bahrain I have felt really strong and controlled.

"I just want to try to continue driving like I have been because last year it was too close here and in Monaco and I aim to have a bit more of a cushion this time."

Hamilton won in Spain for the first time in his career last season.