The women inflicted a second-half blitz on Australia to win a rip-roaring final 31-21, before the men’s team denied Ireland their first world series title in a tight decider that finished 17-14.
Singapore was the seventh and closing leg of the series, with the grand finals poised to begin in Madrid on May 31.
The Black Ferns made predictably light work of Fiji in their semi-final. They raced into a 26-5 half-time lead, before taking their foot off the throttle and allowing the Fijians to close the gap to 33-22. Australia needed a last-minute try from Faith Nathan to beat France 19-12 in their semi.
The final doubled as a fight for the league title, after both teams started the competition on 106 points.
Australia were 14-12 in front at the interval, but Michaela Blyde completed a hat-trick, and there was a try for the irrepressible Portia Woodman-Wickliffe, as New Zealand blew away their rivals.
The Kiwi women have won four successive tournaments, and will be heavily fancied in the Spanish and French capitals.
New Zealand’s men came to Hong Kong last month accompanied by questions over their form and motivation, after a desperate showing in Los Angeles. They have answered their doubters in style, winning every game in Hong Kong then savouring more success in the Lion City.
The All Blacks breezed past Australia 28-12 in their last-four game. Ireland, who finished two points behind Argentina at the top of the season standings, were a much tougher nut to crack in the final, but captain Dylan Collier scored the decisive try in a three-point victory.
The play-off games, typically contested to a backdrop of indifference, came into their own in the wider series context. Argentina’s men beat South Africa 14-10 to earn 12 points for finishing fifth, and seal top spot.
Great Britain completed an incredible escape from the bottom four. They lost their semi-final in crushing fashion, Billy Dardis booting an overtime penalty to win it 15-12 for Ireland.
The Britons knew they needed to beat Australia in the third-place playoff to climb above USA, who edged off-colour France 19-17 in a playoff for seventh. They overpowered the green-and-gold 26-7 to finish one point and one place above USA in the final standings.
The Americans will go into a relegation playoff in Madrid, along with Spain, Samoa and Canada.
France’s women beat Fiji 29-7 in their third-place contest, while Japan, Brazil, South Africa and Spain were all condemned to the Madrid relegation scrap.
