Wales survived a late Argentine surge to defy the odds and upset the host nation in their opening game of the competition. Argentina were guilty of being far too indisciplined while Cai Evans was superb off the tee and with his open play kicking. The flyhalf was the standout performer for Wales landing six penalties and a conversion for a 20-point personal haul which proved to be decisive. Scrum-half Harri Morgan produced on his promise and scored one of Wales' two tries with winger Ryan Conbeer scoring the other.
Los Pumitas ran the ball superbly but it was front ranker Francisco Minervino who scored the first try of the game with winger Rodrigo Isgro and fullback Ignacio Mendy adding to their try-scoring tally.
Evans converted a penalty to give Wales a 8 point lead in the 73rd minute but Argentina cut that with a penalty of their own and looked to be on their way to a come from behind victory before Wales regathered the ball to end the game.