The 1990 Copa Apertura was the 20th edition of the Chilean Cup tournament. The competition started on March 18, 1990, and concluded on June 3, 1990. Only first level teams took part in the tournament. Colo-Colo won the competition for their eighth time, beating Universidad Católica 3–2 on extra-time in the final. The points system in the first round awarded 2 points for a win, increased to 3 points if the team scored 4 or more goals. In the event of a tie, each team was awarded 1 point, but no points were awarded if the score was 0–0.

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More information Colo-Colo, 3 – 2 (a.e.t.) ...

Colo-Colo	3 – 2 (a.e.t.)	Universidad Católica
Díaz 14' Dabrowski 65' Margas 110'		36' Barrera 89' Reinoso

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Lineups in the Final

Colo-Colo:
Daniel Morón; Rubén Espinoza, Eduardo Vilches, Lizardo Garrido, Javier Margas; Raúl Ormeño, Jaime Pizarro, Sergio Díaz, Marcelo Barticciotto (84' Guillermo Carreño), Ricardo Dabrowski, Rubén Martínez (72' Miguel Ramírez).
DT: Arturo Salah.
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Universidad Católica:
Marco Cornez; Rodrigo Blasco, Pablo Yoma, Hugo Monardes; Fabian Estay, Nelson Parraguez, Luis Pérez, Jorge Contreras, Gerardo Reinoso, Rodrigo Barrera (76' Francisco Hórmann), Raimundo Tupper.
DT: Ignacio Prieto.

• Adrián Czornomaz (Cobreloa) 13 goals
• Aníbal González (O'Higgins) 13 goals
• Gerardo Reinoso (Universidad Católica) 13 goals

• 1990 Campeonato Nacional

• Revista Minuto 90, (Santiago, Chile) March–June 1990 (scores & information)
• Solofutbol