Superclásico is the football match in Argentina between Buenos Aires rivals Boca Juniors and River Plate.

[8] In April 2004, the English newspaper The Observer put the Superclásico at the top of their list of "50 sporting things you must do before you die", saying that "Derby day in Buenos Aires makes the Old Firm game look like a primary school kick-about",[9] and in 2016 the British football magazine FourFourTwo considered it the "biggest derby in the world".

[13] By contrast, River Plate became known by the nickname, Los Millonarios (The Millionaires), with a supposedly upper-class support base.

Racing Club de Avellaneda became the first of the Big Five when that same year won the first of their seven consecutive league titles.

[1][2][3][4] 7,000 spectators attended the match,[14] and goals were scored by Cándido García and Antonio Ameal Pereyra (River) and Marcos Meyer (Boca).

[15] The Superclásico is particularly noted for the passion of the fans, with what the BBC describe as "a sea of colourful flowing banners, screams and roars, chanting, dancing and never-ending fireworks".

[8] Both sets of supporters sing passionate chants aimed at their rivals, often based on popular Argentine rock band tunes.

Each stadium, Boca's La Bombonera and River's El Monumental are known to bounce with the simultaneous jumping of the fans.

The pitch was practically flooded, but in spite of this, referee Héctor Baldassi stated that the match could be played.

The disaster was the worst incident in the history of Argentine football and the majority of the dead were teenagers and young adults; the average age of the victims was 19.

Yet others claim that gate 12 was locked, or would not open at the time, and that the fans at the back did not hear the ones at the front telling them to stop coming in.

William Kent, River's former president, claimed that the police were the culprits, as they began repressing Boca fans after they had thrown urine at them from the stands.

As a result of the incident, Boca were disqualified from competition in the tournament and were faced with sanctions imposed by from CONMEBOL.

In the 2018 Copa Libertadores Finals, the bus carrying Boca's players to the El Monumental was attacked by River fans who threw large objects after the police withdrew from the zone.

After drawing 2–2 at La Bombonera and losing its home field advantage, River famously won the game 3–1 after extra time (5–3 on aggregate).

Given the rivalry and the stage, and the fact of having been played in Europe, the 2018 Copa Libertadores Finals gathered unusual attention outside South America.