The winner of each apertura and clausura season gains automatic entry into this tournament. To determine which team enters the tournament at what stage, aggregate points over both seasons is used, with the team that has the most points overall progressing through to the Group stage, and the other team going to the Preliminary Round. If the same team is to win both the apertura and clausura seasons, then that team automatically gains entry into the Group stage, and again, aggregate points over both seasons is used to determine the second team that will qualify to the Preliminary Round. History Foundation In 1921, the Salvadoran Sports Commission (Comisión Nacional de Educación Física) held its very first National Sports Week. Although initially this event did not include any participation from football clubs, it would go on to be the basis of what would grow to be the Liga Mayor of today. In 1924, due to high demand, the commission included a football tournament in the annual Sports Week. Due to the enormous success of this event, it was decided that starting in 1926 the Sports Week tournament would in turn become the country's official National Football Championship. The championship was to be contended by three teams who represent the three different zones of the country playing in a double round robin format. The first three teams to compete in the tournament were, Nequepio (Central Zone), Chinameca Sporting Club (Eastern Zone) and Olímpic (Western Zone). This format was used until 1930. Controversy Controversy occurred after the 1929–30 championship when finalists Excélsior F.C. (who represented the western zone) complained that the second leg of the final against Hércules should not be registered, as they felt that the referee in that game had helped Hércules win the title. The Sports Commission did not agree and the result was not changed. As a result, Excélsior F.C. withdrew from the tournament and Hércules was crowned champion. This led to there being talk of corruption from event organisers against teams from the western part of the country, and as a result teams from that zone refused to take part in any of the following Championships. Because of this there was no national playoff held again until 1937. Return of the National Championship The national championship returned to its original format in 1937, but was short lived, as once again, teams complained of there still being corruption within