That game caught everyone off guard!! How do you manage to keep a high scoring team like PSG to a goalless scoreline when they were dishing out 4nils for fun

Most people never expected Chelsea to get a win in the match, and I don’t even think anyone will even believe Chelsea will score 3 goals in the match, and PSG that were scoring so many goals in the competition couldn’t even get a goal in the final. Seriously it’s really surprising, and I don’t really know what happened to PSG in the final. Before the match started, I was on social media seeing people post about how PSG will destroy Chelsea, most people claimed PSG won’t score less than 4 goals in the match, but the result was just surprising.
But from the way Chelsea played in the match, they really deserve the win, their defense was so strong, and their attack was also good, all the players played well in the match, even Sánchez that have not been performing poorly played well in the match, he made some saves which I never believed he will make, all Chelsea players played with a winning mentality in the match.