
Brackets, or tournament brackets, are tree-like diagrams that represent the series of games played during a knockout tournament. The use of brackets in basketball can be traced back to the late 19th and early 20th centuries. The simplest and most common bracket format is that of the single-elimination tournament, where winners advance within the brackets and losers are eliminated. The NCAA Division I men's basketball tournament is a notable example, with millions of fans filling out brackets to predict the winners of each game. The process of predicting tournament brackets is called bracketology, and it has become a beloved tradition for basketball fans, with some even becoming bracketologists, predicting the field of college basketball participants in the NCAA tournaments.
| Characteristics | Values |
|---|---|
| Origin of Brackets | Late 19th and early 20th centuries |
| Brackets in Basketball | NCAA Division I men's basketball tournament |
| Number of Teams | 68 teams out of over 350 |
| Single-elimination Format | Winners advance, losers are eliminated |
| Double-elimination Format | 2004 National Science Bowl |
| Triple-elimination Format | Australian Football League |
| Bracket Term Origin | American English, derived from the resemblance of the links in the tree diagram to the bracket punctuation symbol |
| Bracketology | Predicting the field of college basketball participants in the NCAA men's and women's basketball tournaments |
| Bracketologist | Joe Lunardi |
| First Known Use of Bracketologist | February 25, 1996, in The Philadelphia Inquirer |
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What You'll Learn

Bracketology
Brackets are tree-like diagrams that represent the series of games played during a knockout tournament. In the context of basketball, brackets are particularly prominent in the NCAA Division I men's basketball tournament, where millions of fans fill out brackets to predict the winners of each game. This process involves 68 teams out of over 350, with most bracket contests involving 64 of these teams. The brackets are much larger than those in North American professional leagues, where no more than 16 teams qualify for the postseason in any major league.
The process of filling out a bracket can be thrilling and entertaining, and it has become a beloved tradition for basketball fans. Bracketology can involve using math and statistics to make predictions, but some also make selections based on team mascots or colours. For example, former US President Barack Obama famously made bracket predictions, presenting his projected winners annually on ESPN in a segment called "Barack-etology".
In recent years, the concept of bracketology has expanded beyond basketball and is now applied to other sports, pop culture, history, nature, and various other topics.
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Single-elimination tournaments
The use of brackets in tournaments, specifically in basketball, serves as a visual representation of how the teams are matched up. Brackets are named as such due to their resemblance to square bracket punctuation marks when written or typed out. In basketball, brackets usually involve two teams playing against each other, with the winner advancing to the next round.
The concept of single-elimination tournaments can be traced back to the mid-1800s or earlier. One of the first recorded instances of a single-elimination tournament in the modern era was the London 1851 chess tournament, organised by British champion Howard Staunton. Staunton invited 16 of the top chess players from across Europe to compete, pairing them into eight matches, with the losers eliminated and the winners advancing. This format gradually reduced the field to a single champion.
In basketball, the use of brackets became prominent with the NCAA Division I men's basketball tournament, also known as March Madness. The tournament, first held in 1939, started with eight teams arranged into two regional brackets. Over time, the tournament expanded, and by 1985, it included 64 teams. The current format features 68 teams, with eight of the lowest-ranked teams playing in the "First Four" to narrow the field down to 64. From there, each round cuts the field in half until a champion is determined.
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The origin of brackets
The concept of brackets is especially prominent in college sports, particularly the NCAA Division I men's basketball tournament, where millions of fans participate in "filling out brackets" by predicting the winners of each game. These brackets are much larger than those in North American professional leagues, with 68 teams out of over 350 advancing to the NCAA men's tournament, and most bracket contests involving 64 teams.
The process of predicting the outcomes of these brackets is called "bracketology," a term coined by Joe Lunardi, who is credited with inventing the term and was first referred to as a "bracketologist" by the Philadelphia Inquirer in 1996. Bracketology involves predicting the metrics used by the NCAA Selection Committee to determine the at-large teams and seeding for the tournament. It has also spread beyond basketball, finding applications in other sports, pop culture, and various areas of study.
The NCAA Tournament bracket consists of 64 teams divided into four regions. The first weekend of the tournament is the most exciting part, with basketball games broadcast non-stop for four days, and brackets constantly changing. By the end of that weekend, the field is narrowed down to 16 teams, known as the "Sweet 16." The tournament progresses through rounds, with the Elite Eight, Final Four, and eventually the national championship game.
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Filling out a bracket
Brackets, or tournament brackets, are tree-like diagrams that represent the series of games played during a knockout tournament. The simplest and most common bracket is the single-elimination tournament. The name "bracket" is derived from the resemblance of the links in the tree diagram to the bracket punctuation symbol. The use of brackets in basketball can be traced back to the late 19th and early 20th centuries.
Understanding the Basics
Before filling out your bracket, it's important to understand the basics of the tournament structure and the seeding process. Each team is assigned a "seed" numbered 1 through 16, with 1 being the best. The brackets are divided into four "regions", and teams are matched against each other based on their seeding. Winners advance in the bracket, while losers are eliminated.
Choosing a Platform
You can fill out your bracket on various platforms, including ESPN, CBS, Yahoo!, and NCAA.com. These platforms offer free bracket challenges and allow you to create groups to compete with friends, colleagues, or other fans.
Selecting a Strategy
When filling out your bracket, you can choose from different strategies. You can go with the "chalk" pick, which means selecting the higher-seeded teams in each matchup. This is a safer option, as the higher seeds are generally considered stronger teams. However, don't get too glued to the numbers, as upsets can happen! Another strategy is to pick teams based on personal connections, such as mascots, school ties, or states.
Accumulating Points
Remember that you can accumulate points in every round, but they are not evenly weighted. Rounds closer to the national championship game offer more points. Focus on choosing the champion and selecting teams you think will make it to the later rounds.
Optional: Joining a Group
Participating in a group is optional but adds to the excitement. You can join or create a group on most platforms, allowing you to compete against others. This can be a fun way to engage with friends, colleagues, or other basketball fans.
Filling Out Your Bracket
Now it's time to fill out your bracket! You can use the "Quick Bracket" option on some platforms, which includes Autofill, Random, Smart Bracket, or Popular selections. Or, you can manually select your winners for each matchup. Don't forget that you can create multiple brackets to enhance your chances of winning.
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Brackets in other sports
Brackets, or tournament brackets, are tree-like diagrams that represent the series of games played during a knockout tournament. The simplest and most common type of bracket is the single-elimination tournament, where winners advance and losers are eliminated. The name "bracket" is derived from American English, referring to the resemblance of the links in the tree diagram to the bracket punctuation symbol "]". While the use of brackets in sports originated in the late 19th and early 20th centuries, they are now prevalent in various sports and leagues beyond basketball.
In North America, leagues like the NHL (National Hockey League) utilise brackets in their post-season tournaments, where only the top-performing teams qualify. Similarly, the Australian Football League (AFL) employs brackets in its finals, often incorporating a bye for the highest-seeded first-round winners. Cricket is another sport that uses brackets; the Page playoff system is employed in various T20 cricket leagues. Teams engage in "Pool Play" games to determine their seeding in the brackets, with winners advancing and losers being eliminated.
The concept of brackets is also prevalent in college sports beyond basketball. For instance, the NCAA Division I Men's Basketball Tournament, with its large bracket size of 68 teams, has become a beloved tradition for fans to fill out brackets and predict game winners. This phenomenon, known as "bracketology," adds excitement and anticipation to the tournament.
Additionally, the FIFA World Cup in football (soccer) employs a round-robin tournament format within each group, where teams play against all other teams in their group to accumulate points. The winners of these initial rounds then advance to a single-elimination round, showcasing the versatility of bracket formats across different sports.
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Frequently asked questions
Brackets in basketball were first used in the late 19th and early 20th centuries.
A bracket or tournament bracket is a tree-like diagram that represents the series of games played during a knockout tournament.
Bracketology is the process of predicting the field of college basketball participants in the NCAA men's and women's basketball tournaments. It was coined by Joe Lunardi.
The NCAA Division I men's basketball tournament is a single-elimination tournament where millions of fans fill out brackets to predict the winners of each game.











































