Club Atlético Acassuso pulled off a major upset in the Copa Argentina, defeating top-flight side Club Atlético Newell's Old Boys 2-0 in a match played on March 30, 2026. The lower-division visitors executed a perfect game plan to secure a memorable victory and advance in the domestic cup competition. The match started with Newell's Old Boys controlling possession, but Acassuso's disciplined defensive block proved difficult to break down. The decisive moment came in the first half when Acassuso capitalized on a counter-attack, catching the Newell's defense off guard to take a 1-0 lead. The underdogs doubled their advantage in the second half, converting a well-worked set-piece to stun the home crowd. Newell's Old Boys, despite having more of the ball and creating several chances, were frustrated by a combination of poor finishing and an inspired performance from the Acassuso goalkeeper. The result is a classic cup upset, highlighting the magic of the Copa Argentina format where teams from different divisions meet. For Acassuso, the win is a historic achievement and a financial boon, while for Newell's, it is a disappointing early exit from a tournament they would have targeted for a deep run. The lineups featured Newell's typical attacking setup, but they were unable to find a breakthrough against a resolute and clinical opponent.