The Apertura and Clausura system was a single round-robin tournament format used for the Argentine Primera División championships.
Introduced in 1990–91, it lasted until the 2012–13 season when it was replaced by the "Inicial and Final", a similar tournament.
The top-flight of Argentine football had 20 teams, with seasons divided into two tournaments: "Apertura" ("opening") championship which opened the season and was contested in the second half of the calendar year, and "Clausura" ("closing") championship that closed the season and was played in the first half of the following year.
Newell's Old Boys beat Boca Juniors on penalties controversially denying Boca their first official league championship since 1981, when Boca had been clearly the best team of the season.
From the 1995–96 season the Argentine Association adopted the 3 points for a win system.