Renault say they will be able to battle for wins all year after taking first and third in Australia with Giancarlo Fisichella and Fernando Alonso.
1 G Fisichella (Renault)
2 R Barrichello (Ferrari)
3 F Alonso (Renault)
4 D Coulthard (Red Bull)
5 M Webber (Williams)
6 JP Montoya (McLaren)
7 C Klien (Red Bull)
8 K Raikkonen (McLaren)
"It's going to be a lot closer this year, but I do feel we're going to be in with a shout all year," said Renault's technical boss Pat Symonds.
"It won't be the last time Giancarlo wins - you're going to see a lot of him this year.
"And getting two on the podium crowns a great day for us."
Fisichella, who dominated the race from pole position, said he had always been confident of doing well this season.
"We have fantastic potential and I felt that from the first time I drove the car during the winter.
"The car was great in the race. We're really in good shape."
Symonds added: "You've got to be careful looking at one race and saying, right that's how the season will go.
"But there are signs, not just this from race but the testing we've been doing over the winter as well, that this is going to be one of the closest seasons for a while.
"I think that ourselves and McLaren are very, very close. Ferrari are there. Williams and BAR won't be far behind for long.
"Red Bull had a great race and maybe they are joining in."
Symonds said Ferrari would be a "serious challenge" throughout the year, and said McLaren's true pace was disguised by their messy weekend.
"It was circumstances, it wasn't a straightforward race,"
"I'm sure they (McLaren) are as quick as us. I think on some circuits they will be quicker than us, at others we will be a bit quicker than them.
"What I do know is that they are quick and they just had a disastrous weekend. It could just as easily have been the other way round with them first and third.
"It's going to be a good, tough fight right through the year, I'm sure."