Jenson Button left trailing in his Brawn GP during practice

Jenson Button's first serious drive in his new Brawn GP ended in disappointment this morning as he trailed in fifth fastest during the two free practrice sessions ahead of Sunday's Australian Grand Prix.

Lewis Hamilton and Jenson Button go head to head

With Jenson Button setting the pace during testing in Spain this month and Lewis Hamilton floundering in what seems to be an uncompetitive McLaren Mercedes, Formula One fans could be about to witness the most dramatic role reversal since Dustin Hoffman donned a wig in Tootsie.

Jenson Button's chance of winning drivers’ world title could be over before it has begun

Jenson Button is facing the real possibility that his best chance of winning the Formula One drivers’ championship could be over almost before it has begun.

Spanish GP debrief: Brawn GP

Brawn GP achieved the team's second one-two result of the 2009 Formula One season today with Jenson Button taking his fourth victory of the year at the Spanish Grand Prix in Barcelona and team-mate Rubens Barrichello securing second position.

Barrichello threatens to quit Brawn

• Brazilian disappointed at being overhauled by victorious Briton• Ross Brawn denies policy to favour Button over BarrichelloDespite finishing first and second in the Spanish grand prix, Brawn GP's smooth season hit a potential rough patch when Rubens Barrichello said he felt that he rather than Jenson Button should have won the ­race. The Brazilian, who was at a loss to explain why his lead during the first 19 laps appeared to have been compromised by a more favourable strategy for Button, threatened to quit if his team-mate is getting preferential treatment."I need to find out what happened. I'm sure everything is OK but if I get the slightest sniff of the fact that they have favoured Jenson, I will hang up my helmet ­tomorrow," Barrichello told a reporter from Speed TV.Button's win was due to a change in his pit-stop strategy during the race and a tyre problem for Barrichello. "I'm disappointed I haven't won because I thought it was in the bag today," said Barrichello. "I had a great start and took the lead from Jenson going into the first corner. Everything felt quite comfortable. I was surprised when they told me they had switched Jenson from three stops to two."Barrichello was asked if he feared a repeat of the team preferences which blighted his time with Michael Schumacher at Ferrari, when Ross Brawn determined the Italian team's ­strategy. "I have had experience of that and if it happens I won't follow any team orders," he said. "I'm making this clear now. But we have a much more friendly situation in this team. There's no way I'm going to be crying and saying I should have had this or that. I had the ability to win, and I didn't."Brawn denied that there had been a policy to favour Button. "Absolutely not," he said. "The ­strategy change was my decision. The engineers and drivers pool their information and make their recommendations but I make the call in the pit lane and, good or bad, we stand by it. If Rubens hadn't had his problem, it would have been incredibly close.""Rubens got an amazing start," said Button. "He's has been very quick all weekend and as soon as he was in front I knew it would be difficult to get ahead. Then I thought I was in trouble when they switched me from three stops to two. I had to push really hard and it worked out. But I'm surprised. I really didn't expect to win this one."Button's fourth win in five races puts the Englishman 14 points ahead of Barrichello.BrawnJenson ButtonFormula oneMotor sportguardian.co.uk © Guardian News & Media Limited 2009 | Use of this content is subject to our Terms & Conditions | More Feeds

Button edges teammate for Spanish Grand Prix victory

He wins his fourth Formula One race of the season. Two rookies crash during Indy 500 practice. Jenson Button won his fourth Formula One race of the season Sunday by taking the Spanish Grand Prix in Barcelona ahead of Brawn GP teammate Rubens Barrichello.