March Madness

A total of 65 teams qualify for the tournament played in March and April. 31 teams earn automatic bids by winning their respective conference tournaments. Since the Ivy League does not conduct a post-season tournament, its automatic bid goes to the regular-season conference champion. The remaining 34 tournament slots are granted to at-large bids, which are determined by the Selection Committee, a special committee appointed by the NCAA. Teams whose tournament inclusion status via at-large bids are unclear are called being on the "bubble". The committee also determines where all sixty-five teams are seeded and placed in the bracket. The tournament is split into four regions and each region has teams seeded 1–16, with the committee making every region as comparable to the others as possible. The selection committee seeds teams in an "S" pattern, with the "highest" #1 seed, in the same region as the "lowest" #2 seed, and so on. The best team in each region plays the #16 team, the #2 team plays the #15, and so on. The effect of this seeding structure ensures that the better a team is seeded, the worse-seeded their opponents will be. The brackets are not reseeded after each round. The tournament is single-elimination and there are no consolation games—although there was a third-place game as late as 1981, and each regional had a third-place game through the 1975 tournament. The single-elimination format produces opportunities for Cinderella teams to advance despite playing higher seeded teams. Nonetheless, despite the numerous instances of early-round Tournament upsets, including four instances of a #15 seed defeating a #2 seed, no #1 seed has ever lost in the first round to a #16 seed.

The teams which are still alive after the first weekend advance to the regional semifinals (the Sweet Sixteen) and finals (the Elite Eight) played on the second weekend of the tournament (again, the games are split into Thursday/Saturday and Friday/Sunday). Four regional semi-final games are played Thursday and four are played Friday. After Friday's games, 8 teams (the Elite Eight) remain. Saturday features two regional final games matching Thursday's winners and Sunday's two final games match Friday's winners. After the second weekend of the tournament, the four regional champions emerge as the "Final Four." The winners of each region advance to the Final Four, where the national semifinals are played on Saturday and the national championship is played on Monday. Before the 2004 tournament, the pairings for the semifinals were based on an annual rotation. For example, in 2000, the winner of the West Regional played the winner of the Midwest regional, and the South winner played the East winner; in 2001, the West winner played the East winner and the South played the Midwest; in 2002, the West played the South and the East played the Midwest. Since 2004 and in response to complaints that too often the two best teams remaining squared off in a semifinal game and not in the final game (such as when the last two remaining 1 seeds, Kansas and Maryland, played in one semifinal while a 2 seed and a 5 seed played in the other semifinal), the pairings are determined by the ranking of the four top seeds against each other. The four number one seeds are ranked before the tournament begins.