Australia will celebrate their first World Series title since 2012 then back up to prove their Sydney 7s win was no fluke in Hamilton's fourth round on Saturday.
The home side trounced South Africa 29-0 in a dominant finale at Allianz Stadium on Sunday night, having beaten series leaders New Zealand 24-12 in the quarter-final and destroying Argentina 28-0 in the semis.
It is a major breakthrough for a side that had earmarked the Sydney tournament, as well as April's Commonwealth Games on the Gold Coast, as ones to win in the preseason.
Tim Anstee, who was one of Australia's best across the three days, said that expectation - no matter how far-fetched it might have seemed to outsiders - had driven them to this point.
"We had that pinned in our room: Sydney," he said.
"We had a big focus on it, we wanted that win."
Coach Andy Friend said the side would enjoy the triumph but look to consolidate after the victory took them to third in the series standings on 43 points.
The 22 points for the win puts them just 15 behind leaders South Africa and 11 behind New Zealand after three rounds.
"For them to turn up and do that in a World Series and knock off a New Zealand and South Africa must give them belief," Walsh said.
"We're going to soak this one up, I promise you because it's been a while, but we'll make sure we turn up next week and back it up."
Australia broke the final open with two tries in the shadows of halftime on Sunday, the second coming via James Stannard from kick-off after the siren to build a 14-0 lead.
Stannard followed that up with a sensational running grubber kick, dived on by John Porch after he had made the initial barging break.
Ben O'Donnell continued the carnage with two tries on the left flank as Australia's dream night was completed against the pre-game favourites.
The hosts broke down the left wing to create the first try, with captain Lewis Holland putting the ball under his arm and absorbing two tackles before crossing.
Earlier, Lachie Anderson's terrific chase and tackle denied South Africa's Rosko Specman the opener as the speedster put a foot into touch while diving for the corner.
In the midst of his final season, Stannard said his teammates were no longer doubting themselves.
"In previous tournaments we wanted to go out and win, but I don't think we really thought we could do it," he said before the match.
"I think we'd just had enough of coming second or losing."
