MELBOURNE - Formula One world champion Jenson Button timed his pitstop to perfection to chalk up his first win for McLaren in a rain-affected and entertaining Australian Grand Prix on Sunday. The Briton, a winner in Melbourne with Brawn GP last year, took the lead when Red Bull's Sebastian Vettel, starting on pole position, was pitched into the gravel mid-race by a brake failure. "It feels so good... Guys, amazing job, I think we got that pitstop pretty much perfect," Button, who went for an early change to slicks that proved crucial, shouted over the team radio after beating Renault's Robert Kubica by 12.034 seconds. "It was the right time. Fantastic job, this is a great way to start the year." Poland's Kubica was comfortably clear of Ferrari's Brazilian Felipe Massa, who nosed out team mate Fernando Alonso for third after the Spaniard had roared back from a first corner spin that left him in last place. With the race starting in wet conditions, Button was the first to pit for slick tyres and seemed to have got it wrong when he immediately skidded off into the gravel. It took only a lap for him to be vindicated, however, as the track dried.