How to run a knockout tournament: byes, seeding and brackets
Updated 15 September 2026 · 3 min read
A knockout tournament is exciting and quick to run, and it punishes a single bad day. Getting the bracket right — byes, seeds and what happens after the groups — is what makes it feel fair.
Matches and rounds
Every match eliminates exactly one team, and all but one team has to be eliminated. So a knockout with n teams always needs n − 1 matches, plus one more if you play a third-place match.
The number of rounds is how many times you can halve the field before one team is left: 8 teams take 3 rounds, 16 take 4 and 32 take 5.
When the number of teams is not a power of two
A bracket works cleanly with 4, 8, 16 or 32 teams. For any other number, use the next size up and give some teams a bye into the second round. The number of byes is the bracket size minus the number of teams, and they go to the highest seeds.
| Teams | Bracket size | Byes | First-round matches | Total matches |
|---|---|---|---|---|
| 6 | 8 | 2 | 2 | 5 |
| 10 | 16 | 6 | 2 | 9 |
| 12 | 16 | 4 | 4 | 11 |
| 20 | 32 | 12 | 4 | 19 |
| 24 | 32 | 8 | 8 | 23 |
If giving a lot of byes feels unfair, play a preliminary round instead: the lowest seeds play off for the remaining places in a bracket of the size below.
Seeding the bracket
Seeding keeps the strongest teams apart until the later rounds. In an eight-team bracket the standard order is 1 v 8 and 4 v 5 in one half, and 3 v 6 and 2 v 7 in the other. If the seeds hold, 1 meets 4 and 2 meets 3 in the semi-finals, and 1 and 2 can only meet in the final.
- Seed from last season’s results, from a group stage, or from a ranking everyone accepts.
- With no fair basis for seeding, draw the whole bracket at random in front of the teams.
- Announce how seeds are decided before entries close, not after you have seen who entered.
Play groups first
A group stage guarantees every team several games before anyone goes home, and it produces seeds for the knockout on merit. A common shape: 16 teams in four groups of four, each playing the other three once, with the top two in each group going through to the quarter-finals.
That is 24 group games and 7 knockout matches — 31 in total, or 32 with a third-place match. Pair the quarter-finals across groups — winner of group A against the runner-up of group B, and so on — so teams do not meet a group rival straight away.
Settle these before the draw
- How a drawn knockout match is decided — extra time, a deciding period or a sudden-death tie-break, whatever your sport’s rules use.
- Whether there is a third-place match.
- Who hosts when there is a choice — usually the higher seed.
- What happens when a team does not turn up. The usual answer is that the opponent goes through.
- Whether bans from earlier rounds or the group stage carry into the knockout.
Knockouts on Spard
Run a straight knockout with an optional third-place match, or groups that feed a knockout. Fixtures are generated from the format, the knockout is seeded from the group tables when the groups finish, and the bracket is on the competition’s public page as results come in.