River Plate defeated Boca Juniors in the finals by an aggregate score of 5–3 to win their fourth tournament title.

[1] As champions, they qualified as the CONMEBOL representative at the 2018 FIFA Club World Cup in the United Arab Emirates and also earned the right to play against the winners of the 2018 Copa Sudamericana in the 2019 Recopa Sudamericana.

The first leg of the final was played at the Estadio Alberto J. Armando in Buenos Aires, Argentina on 11 November 2018, while the second leg took place outside South America at the Santiago Bernabéu Stadium in Madrid, Spain (a neutral venue) on 9 December 2018.

[3][4] The New York Times reported that the second leg was referred to as the "Final to End All Finals" and the biggest game in Argentine sport history but it was postponed and moved due to violence against the Boca Juniors team.

[19] The first stage matches were played on Monday and Friday, instead of the usual midweek of Tuesday, Wednesday or Thursday.

[25] As the identity of the winners of the second stage was not known at the time of the draw, they could be drawn into the same tie with another team from the same association.

[24] The draw for the round of 16 was held on 4 June 2018, 20:00 PYT (UTC−4), at the CONMEBOL Convention Centre in Luque, Paraguay.

If still tied, extra time was not played, and a penalty shoot-out was used to determine the winner (Regulations Article 29).