Defending champions Fiji got their title defence off to a winning start, beating Wales 42-7 in a repeat of last year's final at the end of Day One of the 2014 Hong Kong Sevens.
The season's leading try scorer Samisoni Viriviri scored two and Emosi Mulevoro added 15 points as Ben Ryan's side impressed in the final match of day one.
Earlier, James Rodwell ran out first ahead of England's match to mark his 50th appearance on the World Series stage and scored a try in their 19-12 win over Argentina with captain Tom Mitchell continuing to impress this season, adding the other two tries.
Current World Series leaders South Africa proved too strong for France with a 31-7 victory thanks to two tries from Seabelo Senatla.
Second-placed New Zealand defeated Scotland 33-0, Gillies Kaka and Marty McKenzie scoring nine points each while Cameron Clark scored 11 points in Australia's 28-14 win against Spain.
USA beat Samoa for a second successive week, Zack Test continuing his fine form this season with two tries in their 26-12 win .
John Moonlight also scored twice as Canada beat Portugal 35-7 before Kenya scored seven tries against Sri Lanka to get their campaign off to a winning start.
Collins Injera scored one of the seven tries to take him to joint third in the all-time leading try scorers in the history of the World Series behind Santiago Gomez Cora and Ben Gollings and alongside Fabian Juries.
Pool A: Kenya 41-0 Sri Lanka, Fiji 42-7 Wales
Pool B: Australia 28-14 Spain, South Africa 31-7 France
Pool C: Canada 35-7 Portugal, England 19-12 Argentina
Pool D: USA 26-12 Samoa, New Zealand 33-0 Scotland
James Rodwell, on making his 50th appearance: "In terms of secrets that aren't many. I have been fortunate with injuries. It is a really enjoyable sport and I feel very lucky. To play in front of crowds like this it gives you such a lift."
Mick O'Connor, Australia coach: "I'm not emotional, but conscious of it being my last. It is my favourite, I've had a lot of good years and I will miss it here. At times it was impressive, Spain really exposed us on a couple of occasions but I think we coped with it well. It was a good game."
Zack Test, USA: "All the credit goes to the boys. We didn't start the season great, we had to find our rhythm and I think we have found it. It is all the work we do back in Chula Vista, the hard yards there and the hard metres here."
With thanks to the IRB