Red Bull: Championship fight not over

Brawn's Jenson Button claimed his fifth win in six races at the Monaco Grand Prix last week, extending his lead in the drivers' championship to 16 points over team-mate Rubens Barrichello and 28 points over Red Bull's Sebastian Vettel.

Although Horner concedes that the gap is "huge" he is confident that the pace of the Red Bull, which has been as quick or quicker than the Brawn for much of the season, will allow them to close the gap.

"Brawn has a huge lead in the constructors' and a significant lead in the drivers'," Horner told AUTOSPORT. "We're going to focus on every race as it comes.

"We believe that the next couple of races should play to the strengths of our car and we have some great development in the pipeline.

"Jenson is only four points off a maximum score, which is a remarkable achievement but things can change very quickly. We're going to take every race as it comes and the championship will take care of itself."

Horner believes that circumstances have favoured Brawn's drivers so far this season, and feels that bad luck has denied the Milton Keynes-based team several more wins.

In both the Bahrain and Spanish grands prix, Vettel became caught behind the KERS cars of Lewis Hamilton and Felipe Massa respectively, costing him the chance of challenging Button for victory.

"The cards have definitely fallen in favour of Brawn so far," he said. "Perhaps KERS cars have impacted our races.

"We're just looking forward to having a straight fight in clean air with the Brawns. Other than in China, we haven't really gone head to head with them."