I will talk about Argentina's game and a bit about its situation after beating Mexico.
Argentina: after the game I was scrolling in twitter then I saw that a spanish commentarist said 'It wasn't a win for Argentina, it was an exorcism' and I think it's accurate. Argentina was playing against ghosts of the past, against the fear of being out of the World Cup so soon, and that clearly affected the game as we played poorly the first half. In the second half the coachs decided the game, Martino by retreating his team (mistake) and Scaloni by making some substitutions, all of which had a positive impact. Argentina still needed one more change: the mentality; then Messi appeared. The team needed the impact of a goal, and specifically a Messi goal, to start to believe again. After that Argentina improved a lot, and for that a player was key: Enzo Fernández. Enzo's level is ridiculous, his goal shows all his talent, he played like he's one of the best players of the world and maybe he is going to be up there. He should be starting the game against Poland.
As Scaloni always said, nothing has been won, the team still needs improvement and the game against Poland is still to be played, but like in the last Copa América, Argentina found answers in the crisis. Scaloni and Aimar almost crying after Messi's goal is enough to see how important, and needed, was this exorcism.