Button celebrates fourth win in five races

By Alan Baldwin

BARCELONA (Reuters) - Formula One leader Jenson Button banked his fourth victory in five races on Sunday after a Spanish Grand Prix strategy switch that stunned his downcast Brawn GP team mate Rubens Barrichello.

"I feel like I'm on top of the world at the moment," said Button, now 14 points clear of the Brazilian in the championship.

For the ninth year in a row, victory at the Circuit de Catalunya went to the driver on pole position with the Briton taking the chequered flag 13.0 seconds ahead of Barrichello for Brawn's second one-two of the season.

The Brazilian had seized the lead at the start and was dreaming of his first win since 2004 when the Mercedes-powered team switched Button from a three-stop strategy to what turned out to be a quicker two stops.

Barrichello, who stayed on three stops, looked like his world had been shattered.

"I can't believe how I lost that," the 36-year-old said, adding that he wanted to know why the team had made the sudden decision to change the strategy while keeping him on three stops.

"I'm disappointed I haven't won the race because I thought I had it in the bag today."

Button commiserated and said he had not requested the change while team owner Ross Brawn ruled out any favouritism.