TheApertura and Clausura system was a singleround-robin tournament format used for theArgentine Primera División championships. Introduced in1990–91, it lasted until the2012–13 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. Each Apertura or Clausura consisted of a single round robin of 19 rounds, and there were 10 matches per round.
Thefirst season saw the two champions play achampionship decider to determine the overall champions.Newell's Old Boys beatBoca Juniors on penalties controversially denying Boca their first official league championship since 1981, when Boca had been clearly the best team of the season. Since the following season, both the champions of the Apertura and the Clausura have been recognized as official champions.
Between the1991–92 season and the1994–95 seasons, the league used the old two points for a win system. From the1995–96 season theArgentine Association adopted the 3 points for a win system.
| Club | Total | Half-year tournaments | |
|---|---|---|---|
| Torneo Apertura (1991–2012) | Torneo Clausura (1991–2012) | ||
| River Plate | 12 | 6 | 6 |
| Boca Juniors | 9 | 7 | 2 |
| Vélez Sarsfield | 7 | 1 | 6 |
| San Lorenzo | 3 | 0 | 3 |
| Independiente | 2 | 1 | 1 |
| Newell's Old Boys | 2 | 1 | 1 |
| Estudiantes (LP) | 2 | 2 | 0 |
| Racing | 1 | 1 | 0 |
| Lanús | 1 | 1 | 0 |
| Banfield | 1 | 1 | 0 |
| Argentinos Juniors | 1 | 0 | 1 |
| Arsenal | 1 | 0 | 1 |
