The Olympic champions will now play Fiji in the last eight, with the winners facing either Russian Federation or France in the last four.
That sees New Zealand up against England - who finished third in Pool C - in a quarterfinal at 9.56pm on Sunday (NZT).
It was a disappointing start to the campaign for Ireland, who must now pick themselves back up ahead of Saturday's clash against Australia (6.45am Irish time), before a final pool outing against England.
"We need two players shown the yellow card and we can't let this happen", Tuwai said after the 28-14 win over United States of America in their pool opener of the Cape Town 7s.
The U.S. beat Canada on the first two stops of the circuit - 29-26 and 34-10.
The Canadian men, paying for a string of errors, were beaten 33-21 by Argentina in their opening match. But New Zealand reeled off three late tries to seal the deal.
Vietnam holds second position in regional games
The 2019 Games ended on Wednesday with a rocking closing ceremony in the 20,000-seater purpose-built stadium in Clark. Swimming was Vietnam's third "goldmine", contributing 11 golds to the country's medal count.
Jose Aldo Reacts To Conor McGregor Defending His Substantial Weight Cut
Donald Cerrone fight scheduled for January 19 (AEDT) in Las Vegas. "I think Cerrone lost seven or eight of his last ten fights". At the press conference recently held in Krasnodar, Russia, "The Eagle" was asked about the victor of Conor McGregor vs.
A snow-ice warning has been issued for all of Ireland
Winds will stay light in most areas but it will become windy in the southwest with westerly gales possibly along the coast later. Showers will develop in the southwest later in the morning and these will gradually spread eastwards during the afternoon.
With Samoa and the Aussies occupying fourth and fifth positions prior to the Cape Town event, the pair were the pre-tournament favourites to progress to the last eight.
Theo Sauder opened the scoring for Canada, capping off a storming run by Isaac Kaay through the Welsh defence.
"We made the most of our opportunities in that game", said Hirayama.
Ireland and Kenya continued their giant-killing earlier, beating Samoa and Australia respectively, to eliminate the two highest-ranked teams in the pool.
Surprise package Ireland topped their pool and face Fiji in the quarters while France face Argentina and South Africa meet Kenya.
The Springbok Sevens enjoyed a good fine entertaining performance following a 21-14 victory over France on their second match in the Cup semifinal of the Cape Town Sevens on Sunday.