Hugo Keenan notched a hat-trick as Ireland blew Argentina away in Dublin to secure a statement 42-12 Nations Championship victory.
It has been labelled a "tectonic shift", set to shake up the world of rugby union, but what is the Nations Championship, what have been the results so far, and what is the schedule this November?
Coveted defence coach Shaun Edwards has signed a contract with Argentina until after the 2027 Rugby World Cup in Australia, ending any possibility of him linking up with Steve Borthwick's England.
New Zealand outscored hosts South Africa five tries to one to win the first Test 33-16 at Ellis Park on Saturday and go one-up in the four-match series.
South Africa scraped past Argentina 17-10 in Test rugby at the possible expense of inspirational captain Siya Kolisi in Buenos Aires on Saturday.
Tomas Albornoz has been suspended for four matches after being hit with a misconduct charge following Argentina's Nations Championship defeat against England last month.
Spain head coach Luis de la Fuente has described the conduct of Argentina players after the World Cup final as "intolerable and unacceptable".
Argentina head coach Felipe Contepomi stormed out of his press conference and accused England of showing a "lack of respect" following Saturday's controversial Nations Championship clash.
England's rugby players avenged defeat to Argentina in the World Cup semi-finals with a chaotic, ill-tempered 31-24 Nations Championship victory that went to the wire in Santiago del Estero.
Lionel Messi and Lamine Yamal will play against each other for the first time when Argentina face Spain in Sunday's World Cup final.
Jamie George has threatened to lead his England team off the pitch against the Pumas on Saturday if there is a recurrence of the racial abuse that marred their last appearance in Argentina.
Australia won their series against Argentina after the second Test finished in a 28-28 draw on Saturday night.
Highlights of the clash between Argentina and Australia.
Fresh from the drama of Wednesday's FIFA World Cup semi-final between England and Argentina, the nations meet again on Saturday as part of rugby's Nations Championship in Santiago del Estero.
England's rugby players have revealed they will avoid wearing national shirts in Argentina this week, ahead of facing the Pumas in Saturday's Nations Championship Test in Santiago del Estero.
Argentina outscored Wales by five tries to three as they won 35-21 in the Nations Championship on Saturday to make up for a home loss last weekend.
The World Cup quarter-finals continue on Friday - and we're one step closer to knowing who will lift the trophy on July 19.
©2026 Sky UK
