Button makes it four wins from five

A convincing win by Jenson Button in the Spanish Grand Prix, his fourth in five races, was a one-two for Braun-Mercedes.

Button was followed home by team-mate Rubens Barrichello, and is now 14 points ahead in the championship stakes as he continues to dominate the Formula One grid.

It was the ninth successive year that pole position has led to victory at Barcelona's Circuit de Catalunya, helped by a safety car "rolling restart" after a first-lap pileup.

It was sewn up after Button, unlike Barrichello, elected to change his race strategy from three to two pit stops.

The Spanish GP was arguably the most eagerly anticipated race of the season so far, with most teams fielding heavily revised cars in a bid to end the Brawn-Red Bull stranglehold.

Ferrari was the most improved team, back in top-three contention despite more reliability issues, while Toyota, after pole and a podium in Bahrain, struggled to keep up.

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