Boca Juniors vs River Plate (Superclasico)

The most intense club rivalry in South America rivals the Old Firm in passion but adds a seismic physicality—Boca's La Bombonera stadium literally shakes when fans jump, registering 2.3 on seismographs. Boca represents the working-class port neighborhood of La Boca; River Plate represents wealthier Buenos Aires areas. 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, a first for any major final. This event created 30% more global headlines than a typical Superclasico. Diego Maradona played for both clubs, which is either sacrilege or genius depending on your allegiance.