Jenson Button's superb season continued as he grabbed his fourth race win out of five at a tactical Spanish Grand Prix which Brawn GP totally dominated.

Team-mate Rubens Barrichello got past pole-sitter Button with a great start - but a strategy change benefited the Englishman, who pushed him into second.

Red Bull's Mark Webber was third ahead of team-mate Sebastian Vettel, who passed Felipe Massa's Ferrari late on.

McLaren's world champion Lewis Hamilton finished outside the points in ninth.

Chinese GP winner Vettel and Renault's fifth-placed Fernando Alonso were able to easily overtake Massa late on as the Brazilian had to go into fuel-saving mode in the last few laps and ended up sixth.

BMW Sauber's Nick Heidfeld and Williams' Nico Rosberg collected two and one championship points each, respectively, after they both performed solidly to finish seventh and eighth.

With a victory that was never looked in doubt after he had built up more than 11 seconds between him and the rest of the field half-way through the race, Button has further stretched his lead at the top of the drivers' championship and now sits 14 points ahead of Barrichello.

Veteran Barrichello, the oldest man on the grid, could have recorded a first race victory in five years himself.

But the introduction of the safety car after a first lap collision - for just the fifth time in 18 years at the Circuit de Catalunya - meant Brawn changed Button's race strategy from a three to two pit-stop plan and he drove superbly to make the switch pay off.

BBC Sport Report...

Anyone else getting a bit bored of Brawn Dominating. Ill probably get flamed for this, but the changes were originally put in place to help reduce overall costs, and to make the sport more accessible for lesser teams, trying to even the field out a bit. All its done is recreated the form of Ferrari a few years ago, but with White cars instead of red!