Formula One champion Lewis Hamilton says he hasn't given up on keeping his title, but admits his McLaren car is a long way behind rival Jenson Button's.
Hamilton hasn't had a good start to the season and is seventh in the standings - 32 points behind Button for Brawn.
"Brawn have a championship-winning car," he said. "It is going to be tough but the ambition is always to win.
"If we've still not scored many points by the time we get to mid-season, we may have to knock it on the head."
So far this season, Button has won four out of the first five races of the season, while Hamilton has struggled to make it into the points at all.
Jenson Button lapped Lewis Hamilton during the Barcelona Grand Prix
Talking to the BBC, he said he had a lot of respect for Button, but he's still hoping McLaren can sort their car out so they can make challenge for for the championship.
He said: "We hope that something clicks with our car and it gives us the downforce that we need. Then, we will be right back up there."
And he's hoping to start closing the gap on Button at the Monaco Grand Prix, on 24 May.
"It is not really a high speed circuit so the gap between ourselves and Brawn will be a lot less than it was in Barcelona," he said.
"We can take a step closer to them and be challenging for a top five place."