MotoGP Race Reports
Detailed MotoGP race reports. Read about MotoGP races and events you missed
Corsi was involved in a race-long battle with Belson Derbi's Joan Olive, as those involved in the tussle for the win gradually dropped out of the running.
The Spaniard, who suffered a mechanical failure while leading on the last lap of his home Jerez race and was hit from behind by Marco Simoncelli - bringing them both down - blasted past pole sitter Simoncelli along the back straight during the opening lap, then rode into the distance.
Second on the grid Kallio had snatched the lead into turn one, but pole sitter Bautista and ninth placed starter Simoncelli soon found their way around the Finn and began to break away.
Pedrosa, who had qualified on pole for the fourth successive race, lost out to MotoGP world champion Casey Stoner and team-mate Nicky Hayden into turn one, but was quickly back past Hayden and chasing down the Ducati star.
The first ten laps of the Australian Grand Prix saw Stoner put under a surprising amount of pressure by outgoing world champion Nicky Hayden, before the American's rear tyre began sliding a little too much.
After two days of roasting hot weather, dominated by Dani Pedrosa, rain arrived on Sunday, giving the underdogs a welcome chance to shine and increasing pressure at the front of the field - particularly when Pedrosa and second-on-the-grid Valentino Rossi were only 13th and 17th in the wet warm-up
Mattia Pasini had led comfortably from pole until lap 10 of 23, when the Italian lost the front of his Aprilia at the chicane. That left Faubel, Simone Corsi and Talmacsi fighting for the lead, but they were soon joined by Pol Espargaro and Pasini's team-mate Joan Olive.
Pasini took the early lead from third on the grid, then recovered after being bumped down to fourth to make a clear break by the halfway stage of the 23 laps.
Stoner raised his world championship lead to a near unstoppable 60 points over the Italian, with six rounds remaining, by shrugging off the early challenge of Rizla Suzuki's John Hopkins, then delivering the kind of peerless race pace suggested by his practice times.
Nobody had managed to win a MotoGP event from the front of the grid since the 2006 Japanese GP last September, but Stoner blew that statistic out of the window as he simply rode away from the rest of the field in California to snare his sixth victory of the season.
Kallio took his first 250 pole on Saturday, but lost out to Honda's Andrea Dovizioso into turn one - with Aprilia's Alex de Angelis soon demoting the Finn by a further position.
Rossi's hopes of overturning Stoner's championship lead in the near future took a heavy blow when the Italian fell from his Fiat Yamaha on lap five of 30.
Stoner had blasted past pole sitter Chris Vermeulen to take an early lead into turn one - and was already 1.25secs ahead by the end of the opening lap - while Rossi made little impression, gaining only two places from his eleventh on the grid (set in Friday's rain)...
Reigning 250cc world champion Jorge Lorenzo has taken a dominant home victory at Catalunya, the Fortuna Aprilia star leading from the first turn to the chequered flag for his fifth win from seven starts.
Reigning 250cc world champion Jorge Lorenzo has taken his fourth win from five starts with a hard fought victory at Le Mans in France.
Valentino Rossi threw everything he had at Casey Stoner to try and break the Australian in Sunday's Chinese Grand Prix - but it was the Italian who eventually cracked, leaving the 21-year-old to take his third win from four starts.
Reigning 250cc world champion Jorge Lorenzo took his third win from four starts with a typically dominant victory in Sunday's Chinese Grand Prix at Shanghai.
Derbi's Lukas Pesek took his first ever 125cc grand prix victory at Shanghai - and with it the world championship lead.
Casey Stoner may have led every lap of the Turkish Grand Prix, but all hell broke loose behind with a multi-rider pile-up, frantic passing manoeuvres and major problems for championship leader Valentino Rossi.
Andrea Dovizioso overcame a top-speed disadvantage to end reigning 250cc world champion Jorge Lorenzo's perfect start to the 2007 season, with a daring last-gasp victory in the Turkish Grand Prix.
Valentino Rossi's longest losing streak since 2000 has been broken by an uncompromising victory over home hero Dani Pedrosa in Sunday's Spanish Grand Prix at Jerez, in front of 138,000 fans.
Casey Stoner has defeated former five-times world champion Valentino Rossi to take his first ever MotoGP victory, on his Ducati debut and in the first ever 800cc race, at the season-opening Qatar Grand Prix.
Hector Faubel has taken a perfectly timed last-gasp victory over Aspar Aprilia team-mate Gabor Talmacsi during the season-opening 125cc Qatar Grand Prix.
Nicky Hayden has broken Valentino Rossi's five-year domination of the MotoGP World Championship by dramatically overturning the Italian's title lead in a Valencia showdown won by 2006 WSBK champion Troy Bayliss!