Rugby Sevens: Black Ferns Sevens continue World Series winning spree with title triumph in Vancouver

The Black Ferns Sevens have continued their dominance of the World Series Sevens circuit, winning their fourth consecutive title in Vancouver on Monday (NZ time).

The Kiwi women held on for a 19-12 win in the final against Australia, extending their lead atop the championship standings to 14 points ahead of their trans-Tasman rivals.

The Kiwis opened the scoring through a quick tap-and-go from captain Sarah Hirini, sparing the blushes of Jorja Miller, who moments earlier had fumbled the ball over the line to blow a certain try.

The Australians struck back immediately courtesy of the hotstepping of Madison Ashby.

The Black Ferns Sevens skipper ensured her side went into the interval with the lead, after drawing a pair of defenders and setting Stacey Waaka free to go 60m down the sideline to score.

Miller compensated for her earlier indiscretion for the first points of the second half, extending the NZ lead to 19-7.

Charlotte Caslick reduced Australia's deficit with a try a minute later, setting up an exciting final two minutes.

But the New Zealanders were able to hold on to complete another convincing three days of work, momentum they'll look to continue for the iconic Hong Kong leg at the end of the month.

The NZ women earned their place in the final with a dominant 36-7 semi-final win over the French in the semi-finals, after scraping past hosts Canada 10-5 in a tense quarter-final to secure qualification for next year's Paris Olympics.

Meanwhile, the All Blacks Sevens have cemented a fifth-place finish, after a 50-7 demolition of the United States.

After overwhelming them 52-0 in poolplay, the win was their second of the tournament against the Americans, with Joe Webber running in a hat-trick of tries.

Their hopes of a third consecutive tournament victory ended with defeat to Australia in the quarter-finals.

New Zealand 19 (Hirini, Waaka, Miller tries, Nathan-Wong 2 conversions) Australia 12 (Ashby, Caslick tries, Levi con)