'Red Bull Racing are Brawn's biggest threat'

Ross Brawn believes Red Bull are his team's biggest threat in this year's title race.
Sunday's Spanish GP once again saw Brawn GP claim the victory with Jenson Button leading home Rubens Barrichello in the team's second 1-2 finish of the season. Red Bull Racing, though, weren't far behind with Mark Webber and Sebastian Vettel claiming third and fourth places.
The Barcelona result sees Brawn continue to lead both the Drivers' and Constructors' Championships while Red Bull and its two drivers are the nearest threat.
"They've a very strong team, a good group of people, good drivers so it looks to me at the moment they're the main challenge to us," said Brawn.
"Other teams will come and go during the season, but in terms of a long-term challenge then Red Bull look very strong."
The Englishman, however, is confident that if his team keeps up the pace and continues to fight for race wins no matter what, the title could yet be theirs.
"We are fighting tooth and nail to win every race and do as good a job as we can," he added.
"The team is performing well, the drivers are performing well, the factory is working well, the engineers in the briefings are solid, people are working diligently at making the car better and the pit stops are perfect.
"So it's a team that has really come together. The adversity of the winter seems to have gelled everything even more. Everything is running like clockwork at the moment.
"We all know destiny is just around the corner, so we are being cautious."