The Girls started the morning against a well-matched Irish squad, who were beating them come half-time.
But a no-nonsense team talk by Head Coach Katie Lamond and reorganisation of their court play saw the girls rally and win out 53-47. Manchester Mystics' Anya Williams top scored with 13 points.
They then followed up that up with a more straightforward 69-44 dub against a resistant Scotland.
The Boys - led by Head Coach Lewis Scott - had an equally challenging first game against Ireland after the tournament's opening ceremony, but pulled away in the fourth quarter to win comfortably, 86-68.
Their follow up against the Scots ended 97-74, meaning both teams have to beat Wales in the final day of competition to take home the spoils.
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England U17s are clashing against the Home Nations of Scotland and Wales, as well as invited guest, Ireland this weekend.
Heading up the boys' team is Myerscough's Lewis Scott, supported by St Bonaventure's Basketball Coach Charles Vuong, whilst Katie Lamond of City of Leeds Basketball Club takes on head coaching duties for the girls. Her right hand woman is serial WNBL MVP winner, Ipswich's Harriet Welham.
The tournament is being hosted across two venues at Cardiff Metropolitan University.
All games taking place will be live streamed on Basketball Wales' YouTube channel.
Tickets are available via the link below and games will be statted via FIBA Live Stats.
Last year, England Men's and Women's squads finished in second place after losing their opening games to Ireland in what was then the U18 Four Nations Tournament.
The revamped tournament saw the age categories realigned to identify players earlier and give coaches the opportunity to work with them over a longer period before feeding them through to GB level. Hosting during the summer time has also removed calendar clashes with the domestic seasons in each country.
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Scores will be updated here as the tournament progresses.
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A gallery from the competition will appear below.
