Sebastian Vettel quickest in practice ahead of Australian Grand Prix . Sunday 's race in Melbourne is the first of the 2013 Formula One season . The German driver was fastest on Friday and Saturday, but he has been struggling with a gearbox problem since qualifying at Monza last weekend. ` Overall it was a good day , if perhaps not the smoothest , '' reflected Hamilton . Mercedes ' Nico Rosberg third fastest , Lewis Hamilton seventh .
Sebastian Vettel quickest in practice ahead of Australian Grand Prix . Sunday 's race in Melbourne is the first of the 2013 Formula One season . The German driver was fastest on Friday and Saturday, but he has been struggling with a gearbox problem since qualifying at Monza last weekend. Mercedes ' Nico Rosberg third fastest , Lewis Hamilton seventh .