Boca Juniors vs River Plate (Superclasico)

The most intense club rivalry in South America. Boca represents the working-class port neighborhood of La Boca; River Plate represents the wealthier areas of Buenos Aires. The 2018 Copa Libertadores final (the "SuperFinal") was so chaotic — River fans attacked the Boca team bus with rocks, tear gas entered the bus, players were hospitalized — that the second leg was moved to Madrid. La Bombonera (Boca's stadium) literally shakes when fans jump, registering on seismographs. The atmosphere is widely considered the most intense in world football. Diego Maradona played for both — which is either sacrilege or genius depending on your allegiance.