Nico Rosberg fastest ahead of team Lewis Hamilton in Melbourne GP practice . Mercedes duo dominated last season winning all but three of 19 races . Giedo van der Garde does n't race for Sauber despite court ruling . Sebatian Vettel makes good start for new team Ferrari finishing second practice in third .
Nico Rosberg fastest ahead of team Lewis Hamilton in Australia GP practice . Mercedes duo dominated last season winning all but three of 19 races . Giedo van der Garde does n't race for Sauber despite court ruling . Sebatian Vettel makes good start for new team Ferrari finishing second practice in third .