Argentina, which stands eighth in the HSBC World Rugby Sevens Series, took advantage of early errors from No. 12 Canada to prevail 19-14.
Douglas now has 133 career tries for Canada.
Ravouvou's second would give New Zealand the lead once more before halftime, the Kiwis going into the break 21-14 ahead.
The Canadian men open play on Saturday against France before taking on Portugal.
'The King is back!' - Liverpool fans rejoice as Salah ends drought
He added: "We have 82 points now, that is massive in this insane league and everyone is waiting for us (to slip up)". Mo Salah could not pass for his goal, go, go, go and world-class finish. "So go, go, go and then finish it off".
England's Dan Norton became the leading try scorer in the history of the tournament as he helped his team beat Wales 36-19, breaking the record set by Collins Injera at the 2017 event.
Norton broke the record set by Collins Injera in 2017 as England moved into second place in Pool D with the victory, but US are top after beating Spain 36-7.
Kazakhstan also still have hopes of reaching the series after winning one of their three pool matches in Hong Kong to reach the last eight, alongside Hong Kong who booked their place in the quarter finals with a 26-5 win over Uganda.
South Africa, third on the overall standings, also started with a win, defeating Japan 22-7 in Pool A.
Yankees' Miguel Andujar suffers torn labrum, could require season-ending surgery
Sabathia is to pitch five innings Sunday for Class A Tampa, then could start what he says will be his final major league season. As the club nurses Andujar's injury, a more definitive answer will emerge about his status for the rest of the season.
Australia are licking their wounds after losing 40-19 to New Zealand in their opening match of the "Pool of Death", with Fiji and Kenya their opponents on Saturday.
Regan Ware would double New Zealand's lead just three minutes later, thanks to some clever play from Sione Molia in support.
Elsewhere in Pool C, it was a repeat of last year's final with Fiji beating Kenya 22-5.
In the women's tournament, Brazil beat Scotland 28-19 to win the title on Friday.
Verizon Moto Z3 gets Android 9 Pie update, 5G Moto Mod support
You need more cell sites to cover the same area compared with LTE, including indoor networks like the one at US Bank Stadium. No other phone sold by the carrier will be able to reach the speeds Verizon promises, leaving very few potential 5G users.