Bracket (tournament)

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The partially-completed bracket for a 16-player single-elimination tournament. The quarterfinals have been completed, and the semifinals will be Lisa vs. Ernie, and Andrew vs. Robert. The final will be between the two semifinal winners. SixteenPlayerSingleEliminationTournamentBracket.svg
The partially-completed bracket for a 16-player single-elimination tournament. The quarterfinals have been completed, and the semifinals will be Lisa vs. Ernie, and Andrew vs. Robert. The final will be between the two semifinal winners.

A bracket or tournament bracket is a tree like bracket that represents the series of games played during a knockout tournament. Different knockout tournament formats have different brackets; the simplest and most common is that of the single-elimination tournament. The name "bracket" is American English, derived from the resemblance of the links in the tree diagram to the bracket punctuation symbol ] or [ (called a "square bracket" in British English). The closest British term is draw, although this implies an element of chance, whereas some brackets are determined entirely by seeding.

Contents

In some tournaments, the full bracket is determined before the first match. In such cases, fans may enjoy trying to predict the winners of the initial round and of the consequent later matchups. This is called "bracketology", particularly in relation to the NCAA Division I men's basketball tournament. This prediction is not possible in tournaments such as the FA Cup and the UEFA Champions League knockout phase, in which the pairings for a later round might not be made until after the previous round has been played (UEFA Champions League makes its ultimate bracket draw at the quarterfinal stage [1] ).

Usage in North America

Brackets are commonly found in major North American professional sports leagues and in U.S. college sports. Often, at the end of the regular season, the league holds a post-season tournament (most commonly called a playoff) to determine which team is the best out of all of the teams in the league. This is done because often in American professional sports there are at least two different conferences, and teams mostly play other teams in their own conference. Examples of this are the American Football Conference and the National Football Conference in the NFL, the American League and the National League in Major League Baseball, and the Eastern Conference and the Western Conference in the NBA or NHL.

When there are only two different conferences, there are two sides of the bracket. One conference is on one side, while the other is on the opposite side. Each side is organized according to a team's seeding; higher-seeded teams are matched against lower-seeded teams. Teams that qualify for the post-season tournament only compete against teams in their own conference, until only one team from each conference remains. These two teams, called the conference champions, play each other to determine the best in the league. Other leagues, like the NHL, have two conferences, each of which is divided into divisions, usually by region. In the post-season tournament, only the teams with the best records qualify, except the division winner (and also #2 and #3 in the division in the NHL) having an automatic entry into the tournament.

Some North American professional post-season tournaments are single-elimination format. If a bye is required, the top seeded teams usually get the bye. There is usually no third place match to separate the third and fourth place teams.

The concept is even more visible in college sports, most notably in reference to the NCAA Division I men's basketball tournament, in which millions of casual and serious fans "fill out brackets"—predict the winners of each game in the tournament—in both formal contests, sponsored by various corporations, and informal betting pools among friends or colleagues. The brackets are much larger than those in North American professional leagues—while no more than 16 teams qualify for the postseason in any major North American league (this is the case in the NBA and NHL), 68 teams (out of over 350) advance to the NCAA men's tournament, with most bracket contests involving 64 of these teams.

Examples

The diagrams for formats other than single-elimination are more complex than a simple tree.

Types of brackets

Single Elimination
Teams play "Pool Play" games in order to be "seeded" for the Brackets. Once in the brackets, teams play. Winners advance within the brackets to the right, whereas losers are eliminated in "Single Elimination"
Double Elimination
Teams play "Pool Play" games to gain their "seeding" going into the brackets. Each team plays its first games. Winners advance to play the winners. Losers play a consolation round.

Versions of advancement

March Madness Seeding (Best v Worst in a division)
Divisions are broken into pools (e.g., North, South, East, West) and within each pool teams are ranked. The top seed plays the worst seed, the second best seed plays the 2nd worst seed within the pool, etc., until all teams play their first round. If the pool has an odd (not divisible by 2) number of teams, there will be a "play in" game of the worst vs the 2nd worst team. Such a seeding system produces a wide variety of matches, but requires many games to determine an outcome.
Jacobian Ladders (Best in pools play, 2nd best in pools play each other, 3rd best in pools play each other, etc.)
Within each pool, the number 1 team plays all the other number 1 teams within the other pools. Number 2s play number 2s, numbers 3s play number 3s, etc.
  • Assuming an even number of pools (e.g., pool A, B, C, and D), each of the #1 ranked team based upon their pool play results play an initial game (A1 vs B1, C1 vs D1). Winners go to the championship. Losers play for 3rd and 4th place.
  • Assuming an odd pools number of pools (e.g., pool A, B, and C), Seed 1 from Pool A (A1) plays seed 1 from Pool B (B1). C1 plays the "Wildcard" from the second best finishers from within all 3 pools based upon the ranking criteria.
  • All #2, #3, etc., ranked teams play in "Consolation rounds" to determine their ranked order
Winners of these pools play at most two games to determine the champion of the division. The end result can be sensitive to ranking criteria and allocation of teams to pools.

Related Research Articles

The playoffs, play-offs, postseason or finals of a sports league are a competition played after the regular season by the top competitors to determine the league champion or a similar accolade. Depending on the league, the playoffs may be either a single game, a series of games, or a tournament, and may use a single-elimination system or one of several other different playoff formats. Playoff, in regard to international fixtures, is to qualify or progress to the next round of a competition or tournament.

A tournament is a competition involving at least three competitors, all participating in a sport or game. More specifically, the term may be used in either of two overlapping senses:

  1. One or more competitions held at a single venue and concentrated into a relatively short time interval.
  2. A competition involving a number of matches, each involving a subset of the competitors, with the overall tournament winner determined based on the combined results of these individual matches. These are common in those sports and games where each match must involve a small number of competitors: often precisely two, as in most team sports, racket sports and combat sports, many card games and board games, and many forms of competitive debating. Such tournaments allow large numbers to compete against each other in spite of the restriction on numbers in a single match.
<span class="mw-page-title-main">College World Series</span> Annual college baseball tournament held in Omaha, Nebraska

The College World Series (CWS), officially the NCAA Men's College World Series (MCWS), is a baseball tournament held each June in Omaha, Nebraska. The MCWS is the culmination of the National Collegiate Athletic Association (NCAA) Division I Baseball Championship tournament—featuring 64 teams in the first round—which determines the NCAA Division I college baseball champion. The eight participating teams are split into two, four-team, double-elimination brackets, with the winners of each bracket playing in a best-of-three championship series.

A sports league is a group of individual athletes, sports teams or clubs who form a league to compete against each other and gain points in a specific sport. At its simplest, it may be a local group of amateur athletes who form teams among themselves and compete periodically, at its most complex, it can be an international professional league making large amounts of money and involving dozens of teams and thousands of players.

A single-elimination, knockout, or sudden-death tournament is a type of elimination tournament where the loser of each match-up is immediately eliminated from the tournament. Each winner will play another in the next round, until the final match-up, whose winner becomes the tournament champion(s). Each match-up may be a single match or several, for example two-legged ties in European sports or best-of series in North American pro sports. Defeated competitors may play no further part after losing, or may participate in "consolation" or "classification" matches against other losers to determine the lower final rankings; for example, a third place playoff between losing semi-finalists. In a shootout poker tournament, there are more than two players competing at each table, and sometimes more than one progresses to the next round. Some competitions are held with a pure single-elimination tournament system. Others have many phases, with the last being a single-elimination final stage, often called playoffs.

<span class="mw-page-title-main">Double-elimination tournament</span> Type of elimination competition

A double-elimination tournament is a type of elimination tournament competition in which a participant ceases to be eligible to win the tournament's championship upon having lost two games or matches. It stands in contrast to a single-elimination tournament, in which only one defeat results in elimination.

<span class="mw-page-title-main">Repechage</span> Practice amongst ladder competitions

Repechage is a practice in series competitions that allows participants who failed to meet qualifying standards by a small margin to continue to the next round. A well-known example is the wild card system.

In sport, seeding is the practice of separating the most skilled competitors from each other in the early rounds of a tournament. Players or teams are "planted" into the bracket in such a manner that the best do not meet until later in the competition, usually based on ranking from the regular season. The term was first used in tennis, and is based on the notion of scattering the top players' names across the bracket in the way that a sower scatters seeds.

An athletic conference is a collection of sports teams which play competitively against each other in a sports league. In many cases conferences are subdivided into smaller divisions, with the best teams competing at successively higher levels. Conferences often, but not always, include teams from a common geographic region.

There are a number of formats used in various levels of competition in sports and games to determine an overall champion. Some of the most common are the single elimination, the best-of- series, the total points series more commonly known as on aggregate, and the round-robin tournament.

A wild card is an invitation to a tournament or playoff awarded to a team or individual that does not qualify through an automatic bid. In some events, wildcards are chosen freely by the organizers. Other events have fixed rules. Some North American professional sports leagues compare the records of teams which did not qualify directly by winning a division or conference.

The season structure of the National Hockey League (NHL) is divided into the pre-season, regular season, and the Stanley Cup playoffs. In the pre-season, which is generally held during the last two weeks of September, each team plays several not-for-the-record exhibition games. In the regular season, which generally runs from early October through early April, teams play 82 games which determine their standings. The three highest-placed teams in each division and two wild card teams per conference enter the playoff elimination tournament to determine the Stanley Cup champion.

A one-game playoff, sometimes known as a pennant playoff, tiebreaker game or knockout game, is a tiebreaker in certain sports—usually but not always professional—to determine which of two teams, tied in the final standings, will qualify for a post-season tournament. Such a playoff is either a single game or a short series of games.

<span class="mw-page-title-main">Southeastern Conference baseball tournament</span> American college baseball championship

The Southeastern Conference baseball tournament is the conference tournament in baseball for the Southeastern Conference (SEC). It is a partially double-elimination tournament and seeding is based on regular season conference records. The winner receives the conference's automatic bid to the NCAA Division I baseball tournament. The SEC Tournament champion is separate from the conference champion. The conference championship is determined solely by regular season record.

The Stanley Cup playoffs is the annual elimination tournament to determine the winner of the Stanley Cup, and the league champion of the National Hockey League (NHL). The four-round, best-of-seven tournament is held after the NHL's regular season. Eight teams from each of the league's two conferences qualify for the playoffs based on regular season points totals. The final round is commonly known as the Stanley Cup Finals, which matches the two conference champions.

The Atlantic Coast Conference baseball tournament, sometimes referred to simply as the ACC tournament, is the conference championship tournament in baseball for the Atlantic Coast Conference (ACC). In 2017, the event adopted a modified twelve-team pool play format. The winner receives the conference's automatic bid to the NCAA Division I baseball tournament.

The National Basketball Association (NBA) playoffs is the annual elimination tournament held to determine the league champion. The four-round, best-of-seven tournament is held after the league's regular season and its preliminary postseason tournament, the NBA play-in tournament. Six teams from each of the two conferences automatically advance to the playoffs based on regular season winning percentage, while those teams finishing seven through 10 from each conference compete in the play-in tournament to determine the final two playoff seeds.

The Major League Baseball (MLB) postseason is the annual playoff elimination tournament held to determine the champion of MLB in the United States and Canada. Since 2022, the postseason for each league—American and National—consists of two best-of-three Wild Card Series contested by the lowest-seeded division winner and the three wild card teams, two best-of-five Division Series (LDS) featuring the wild-card winners and the two highest-seeded division winners, and finally the best-of-seven League Championship Series (LCS). The winners of the American League Championship Series (ALCS) and the National League Championship Series (NLCS) play each other in the best-of-seven World Series. Under this system, the postseason consist of between 13 to 22 games per team. 13 if they sweep every series & 22 if each series goes the distance. The postseason tournament takes place after the conclusion of MLB's regular season and takes approximately one month to complete.

The Inline Hockey World Championship is an annual inline hockey tournament organized by World Skate. Prior to the creation of World Skate in September 2017, the championship was administrated by the Comité International Roller In-Line Hockey (CIRILH), an organization and discipline of Fédération Internationale de Roller Sports (FIRS). It is the sport's highest-profile annual international tournament.

The 2021 Atlantic Coast Conference baseball tournament was held from May 25 through 30 at Truist Field in Charlotte, North Carolina. The annual tournament determined the conference champion of the Division I Atlantic Coast Conference for college baseball. Duke will receive the league's automatic bid to the 2021 NCAA Division I baseball tournament after defeating NC State in the Championship game.

References

  1. "UEFA Champions League quarter-final and semi-final draws". UEFA.com. Retrieved 2 January 2021.