There are very few matches in a football season that are true game-changers. Regardless of how well or badly a team is playing, a positive or negative result in these kinds of matches affect the outcome of the entire campaign. They can happen in the beginning or the end of the season, and you almost never know them when they happen.
But when Atlético Madrid and Barcelona kick off the second leg of the Champions League quarterfinal at Vicente Calderón on Wednesday, we will be looking at a game-changer. These two fierce, competitive teams with completely different styles create great moments every time they play, and what we witness in this game could very well decide their fate this season.