New Zealand were the first to score, with flying winger Portia Woodman beating three Australian defenders in a scorching 60 metre run to the tryline.
The men kick off their campaign against Zambia tomorrow, followed by pool matches against Kenya and Canada.
The team's performance in Hong Kong showed that they have closed the gap on continental rivals South Africa - except in one area, fitness.
Any hopes South Africa might have had of making the semi-finals were well and truly dashed as the Canadians beat them 29-0 before the New Zealanders humiliated them 41-0.
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Adriaan Nel and the BlitzBokke could be on course for another Commonwealth Games decider against New Zealand.
Rosko Specman opened the scoring for South Africa with just over two minutes left in the first half.
Even with a couple of golds in the marathons, seventh-placed Wales can only draw level on golds with New Zealand, who would still have the bigger overall total.
Against current HSBC World Rugby Women's Sevens Series champions, New Zealand, it was more of the same.
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Nearly immediately after the kickoff, South Africa regained possession and Cecil Afrikia sped away to score his first try.
Joelle King and Amanda Landers-Murphy team up in the final of the women's doubles squash at 2pm, against the Indian pairing of Joshna Chinappa and Dipika Pallikal Karthik.
England's men's sevens squad are also through to the semi-finals.
The women's final is at 4.42pm, with the men's decider at 5.04pm.
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