(CNN)Reigning world champion Lewis Hamilton and teammate Nico Rosberg resumed where they left off last season as the 2015 Formula One season kicked off in Melbourne. 

The Mercedes duo, who took pole position in all but one of last season's qualifying sessions and won 16 of the 19 races, were dominant in first and second practice for Sunday's Australian Grand Prix. 

Rosberg, who won last year's GP at Albert Park, was fastest around the Melbourne street circuit on Friday, finishing 0.1 second ahead of Hamilton with Sebastian Vettel taking third spot for his new team Ferrari -- the German four-time world champion finished 0.715 seconds off the pace set by his compatriot. 

Vettel's Finnish teammate, Kimi Raikkonen was fourth, 1.1 seconds behind the lead with Williams' Valtteri Bottas and Daniel Kvyat, who was making his debut for Red Bull since his switch from Toro Rosso, finishing fifth and sixth respectively. 

"It was great to be back in the car at this awesome track," Rosberg said, the official Formula One site reported. 

"Today we have the evidence that our Silver Arrow is quick again and it was a great start for the team," he added. 

"It seems again that it's very close between Lewis and me and he is a great driver, so I need to nail the setup every time to come out on top. This year will be a big battle again against him, I'm sure. I'm looking forward to the first weekend of the new season with all the great fans out there." 
What is there proof of?
Today we have the evidence that our Silver Arrow is quick again