Championship leader Jenson Button on Sunday maintained his dominance of the 2009 season, heading a Brawn one-two in the Spanish grand prix.

Championship leader Jenson Button on Sunday maintained his dominance of the 2009 season, heading a Brawn one-two in the Spanish grand prix.

The Briton, watched on by his parents, pulled his lead in the drivers' championship over teammate Rubens Barrichello to 14 points, having now won four of the five grands prix so far this season.

Barrichello, from third on the grid, passed Button at the first corner of the race, but his three-stop strategy was never going to beat the more effective two-stopper.

"We switched from a three stopper to a two stopper. We thought three would be quicker but we changed to cover all the bases," said Button.

Barrichello explained: "I heard that they changed Jenson's strategy but I had to keep on pushing. I was actually quite surprised (to hear of the change) but from then on I just had to go flat out.

"I'm disappointed not to win because I thought I had it in the bag," he added.

"I don't know if something broke on my car, but it was a big struggle. In the end I am relieved to be second."

The two Red Bulls, headed by Australian Mark Webber, followed the Mercedes-powered pair across the line, after Sebastian Vettel - passed by the KERS-equipped Felipe Massa at the start - then trailed the Ferrari for the entire race.

Massa would have lessened Ferrari's woes with a fourth place, but the Brazilian had to slow and conserve fuel in the closing laps, ultimately also ceding fifth to Fernando Alonso and then abandoning his depleted F60 on the slowing down lap.

The other Ferrari driven by Kimi Raikkonen failed, while Jarno Trulli, the two Toro Rossos and Adrian Sutil retired in a big first lap crash.

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