Mercedes' Nico Rosberg won a dramatic Australian Grand Prix, after a huge crash for McLaren's Fernando Alonso.

A bad start dropped Lewis Hamilton from pole to sixth but he fought to second.

Rosberg took advantage when the race was stopped following Alonso's high-speed barrel-roll to switch strategy and overhaul early leader Ferrari's Sebastian Vettel.

Vettel's strategy gamble on super-soft tyres mid-race failed and he took third ahead of Red Bull's Daniel Ricciardo.

A thrill-a-minute race, with action throughout the field, provided the start to the season for which F1's bosses were hoping.

But its unpredictable nature meant it was impossible to form a definitive judgement on the exact relative competitiveness of the Mercedes and Ferrari teams who will dispute the season.