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Tennis

Tennis has no league. It is a year-long circuit of individual knockout tournaments, run by separate bodies, where a player's position comes from a rolling ranking rather than from a table. That single difference explains most of how the sport is organised.

Who runs what

Tennis is governed in layers, and the layers are genuinely independent of one another.

The tours. The ATP runs the men's professional tour and the WTA the women's. They organise the weekly tournament calendar, the rankings and the season-ending finals.
The national associations and the ITF. The international federation and the national bodies that own the four major championships run the Grand Slams and the international team competitions.
The tournaments themselves. Individual events hold their own entry lists, seedings and schedule, within the rules of the tour that sanctions them.

Because no single body owns the whole calendar, a tournament's category determines its draw size, its ranking points and how many sets a match is played over. That is why the same two players can meet in a best-of-three match one week and a best-of-five match the next.

How a tournament is played

Single elimination

Almost all tennis is a knockout draw. Lose and you are out. A draw is published in advance with every player placed in a bracket, which is why the shape of the draw matters as much as form: a difficult quarter can remove a contender before the closing rounds.

Seeds, byes and wildcards

A set number of players are seeded and placed at fixed points in the draw so that the strongest entrants cannot meet in the opening round. Where a draw is not exactly filled, top seeds may receive a bye — a free pass into the next round. Places not taken by direct entry are filled by qualifiers who win through a preliminary event, and by wildcards awarded at the tournament's discretion. Wildcards are the main route by which a host nation's players enter a major draw.

Scoring

Points are won within a game, games within a set, and sets decide the match.

Within a game the count runs 15, 30, 40. A player needs four points, and must lead by two, which is why a level game is called deuce and requires a two-point margin to win.
A set is won by taking six games with a two-game lead. At six games all, most tournaments play a tie-break — a short race to a set number of points, again by a two-point margin.
Matches are best of three or best of five sets. Which one applies depends on the tournament and the category.

Rankings

Rankings are based on points earned over a rolling window rather than over a fixed season, so a player's position is a running total of recent results. This is what makes defending a title relevant: points earned at an event are replaced when the same event comes round again, so a player who does not repeat a result loses the points that result carried. The window length and the points awarded per round are set by the tour.

Surfaces

Tennis is played on hard courts, clay and grass, plus indoor surfaces. The surface changes how the ball behaves — faster and lower on grass, slower and higher-bouncing on clay — which is why some players are markedly stronger at certain events. Court speed has been adjusted at several venues over the years, so a surface label alone does not fully describe how a court plays.

Where the format is genuinely under review

Match length is the one part of tennis structure that is actively contested rather than settled, and it is worth stating carefully.

Best-of-five is under discussion, not decided

Men's singles at the major championships has long been played as best-of-five sets, with women's singles best of three. In September 2026, senior figures including the incoming chief executive of Tennis Australia publicly called for best-of-five to be reduced at the majors, and a tour official suggested a shift in scoring was possible. No change had been confirmed at the date checked below. Treat best-of-five at the majors as the long-standing position that is now under active discussion, and confirm the current format with the relevant tournament.

Team competitions

Alongside the individual circuit, nations compete in team events: a men's competition and a women's competition, each with its own format and its own qualifying structure, plus combined and exhibition events. Formats for these have been revised more than once — qualification routes, number of ties and whether matches are best of three or best of five have all changed — so they are best read event by event.

Key terms

The vocabulary that decides how a tennis match is read.
Term	What it means	Why it matters
Draw	The published bracket of a knockout tournament.	Determines who can meet whom, and when.
Seed	A ranked entrant placed at a fixed point in the draw.	Prevents the strongest players meeting immediately.
Bye	A free pass into the next round.	Occurs when a draw is not exactly filled.
Wildcard	An entry awarded at the tournament's discretion.	The usual route for a host nation's lower-ranked players.
Qualifier	A player who entered by winning a preliminary event.	How players outside the entry cut reach the main draw.
Deuce	A game level at 40-40.	Requires a two-point margin; can extend a game indefinitely.
Tie-break	A short points race used to settle a set at six games all.	Removes the possibility of an endless set.
Protected ranking	A ranking held for entry purposes after long injury absence.	Explains an entry that the current ranking would not allow.

What to check at the source

Grand Slam match formats — best-of-five is under active discussion as of September 2026. Check the relevant tournament.
Tour ranking rules — the window and points per round are set by the ATP and WTA.
Team competition formats — qualification routes and tie formats have been revised more than once.

Figures checked: The status of the best-of-five debate was checked on 19 September 2026 and is reported as an open discussion rather than a settled format. Scoring mechanics, draw structure, seeding and ranking principles are durable and are explained without dates. No draw sizes, points values or ranking window lengths are quoted, because none was verified.
Editorial review: Not carried out. No independent review has taken place.