New Zealand, Kenya, South Africa and Australia have all booked their spots in the quarter-finals at the USA Sevens after an enthralling opening day of action in Las Vegas in front of a record day one crowd of 18,441.
In Pool A, back to back champions from Wellington and Sydney New Zealand picked up where they left off in round five of the World Rugby Sevens Series, scoring 80 points and conceding just one try in wins over Russia and Portugal, the same sides that tasted defeat to Benjamin Ayimba's Kenya.
Humphrey Kayange scored his 150th and Kenya's 1,500th sevens try in their win over Russia while Collins Injera scored three times on day one to move within three tries of Ben Gollings and second place in the all-time leading try scorers behind Santiago Gomez Cora.
South Africa also won both of their matches on day one with Bryan Habana returning to rugby sevens after a 12-year absence to score one of the tries of the day as the Blitzboks opened up with a 33-7 win over Canada. Seabelo Senatla then scored a hat-trick in their 36-7 win over Wales, taking his tally for the day to five and 30 for the season.
Canada bounced back from their defeat to Neil Powell's side to draw 26-26 with the hosts USA with both sides aiming to take the second qualification spot from Pool D.
The hosts won their opening match 19-12 against Wales before the enthralling draw with North American rivals and next week's hosts Canada. Having led 26-7 thanks to two superb tries from Perry Baker, tries from Conor Trainor, Nathan Hirayama and Phil Mack, playing in his 50th tournament, drew the scores level.
Elsewhere Pool C is wide open after defending Las Vegas champions and current series leaders Fiji lost to Samoa in their opening match of the day, their first defeat in a pool match since the 2014 London Sevens, before beating France 42-12.
Samoa had the chance to qualify for the Cup with a victory over Argentina but were beaten 25-12 with Bautista Ezcurra scoring twice in the win. Los Pumas' win was their second of the day having earlier beaten France but must wait until day two to confirm qualification for the last eight with a match against Ben Ryan's Fiji.
Australia were the only other side to win both of their matches on day one, beating Scotland and Japan in Pool B to secure qualification to the last eight.
England left it late to snatch a 19-19 draw with Japan who had led 19-5 with Jack Wilson and Phil Burgess scoring the tries to secure the draw before they lost to Scotland 24-14 in the last match of day one.
Pool A: New Zealand, Kenya, Portugal, Russia
New Zealand 42-7 Portugal
Kenya 24-21 Russia
New Zealand 38-0 Russia
Kenya 38-0 Portugal
Pool B: Australia, England, Scotland, Japan
Australia 26-0 Scotland
England 19-19 Japan
Australia 35-5 Japan
England 14-24 Scotland
Pool C: Fiji, Argentina, Samoa, France
Fiji 24-28 Samoa
Argentina 26-7 France
Fiji 42-12 France
Argentina 25-12 Samoa
Pool D: South Africa, USA, Canada, Wales
South Africa 33-7 Canada
USA 19-12 Wales
USA 26-26 Canada
South Africa 36-7 Wales
Fixtures, Day Two: Saturday, 5 March
(Kick-off is local time – GMT minus eight hours)
Portugal v Russia – 11.32
New Zealand v Kenya – 11.54
Samoa v France – 12.16
Fiji v Argentina – 12.38
Scotland v Japan – 13.24
Australia v England – 13.46
Canada v Wales – 14.08
South Africa v United States – 14.35
With thanks to World Rugby's official website