Australia captain Michael Clarke was impressed with his side's all-round performance during the six-wicket victory over England in the first one-day international.
Clint McKay claimed 3-44 as England - coming into the series after a 5-0 Ashes hammering - were restricted to 269-7 batting first.
And Australia openers Aaron Finch (121) and David Warner (65) set up a straightforward run chase with a stand of 163.
Clarke said: "I thought our bowlers did really well on a wicket that was pretty good for batting, and then our batters were outstanding.
"Aaron and David up front got us off to an outstanding start and won us the game.
"Our momentum has come from the series we played in the UK when we lost the Ashes (3-0) and were able to turn that around.
"Our one-day team is different to our Test team but I think these guys are certainly full of confidence."
Finch, whose hundred was the first by a Victorian at the MCG in ODI cricket, is aiming for big things during the remainder of the five-match series.
"It's important to start a series really well, as a batsman that gives you a lot of confidence," he said.
"It's not an easy game when you're chasing your tail and trying to grind out runs towards the end of a series.
"It's important to get them early and then you can play on the back of that, play with confidence and try and turn it into an outstanding series personally, for the team and cement your spot."
After the match Cricket Australia revealed that Shane Watson would be rested for the second match of the series in Brisbane.
Coach Darren Lehmann said before the series he would look to rest his Ashes winners at various stages, with Mitchell Johnson set to return in Queensland after sitting it out at the MCG.
"As we have done with Mitchell in Melbourne, we will look to give Shane a break for the second match," Lehmann said.
Watch the second one-day international between Australia and England from 3am on Sky Sports 2.