The National Collegiate Athletic Association (Philippines) (NCAA) holds its annual basketball tournaments for the Seniors' and Juniors' divisions from June to October of the academic year. The tournament started in 1924, the NCAA's inaugural year, and has been held continuously since then, only interrupted by World War II from 1942 to 1946, suspension of play from 1961 to 1965 due to the proliferation of ineligible players, and the 1980 riot between supporters of La Salle and Letran which wrecked the Rizal Memorial Coliseum which forced the association to suspend the rest of the season. For much of the NCAA's history, the team at the top of the standings during the first half of the season faced the team that won the latter half of the season for the championship; in 1960 if a third team had a better cumulative record than either champion, that team played the champion of the latter half of the season to face the champion of the first half for the NCAA championship. In 1998, the "Final Four" format used in the University Athletic Association of the Philippines (UAAP) was first applied: in a modified Shaughnessy playoff system, the two teams with the best records possess the "twice to beat advantage" in which they only have to win once to advance to the best-of-three finals while their opponents have to win twice. Prior to the introduction of the "Final Four" format, if a team managed to win all of the group stage games (or at least won both halves of the season), the team were named outright champions. At the introduction of the "Final Four" format the unbeaten team had an outright finals berth with the twice to beat advantage while the remaining three teams played in a single-elimination tournament; in 2008, the unbeaten team still qualified outright for the finals but the finals was a best-of-three series. Starting in 2010, the unbeaten team possesses the "thrice to beat" advantage where they only have to win twice while their opponent has to win thrice to win the championship. In 2017, the NCAA reverted to a rule where an unbeaten team still had a bye to the finals but the finals was a best-of-three series and the number 2 team in the stepladder series will not have twice to beat advantage. List of champions per year Early years (1924–1935) The NCAA was founded by the Ateneo de