Tiebreak and Set Format Interpreter

Five published set formats, and the same games score resolves differently under them. Pick the format, enter the games, and this says whether the set is over, whether a tie-break is due now and how long it is.

Last updated 12 Oct 2026

What happens at this games score?

Format ⇄ set state

Which set formatFive formats, five publishers’ documents. The first two are ITF Rule 6 and cover every ordinary set in the professional game. The third is the current Grand Slam deciding set. The fourth is the rule Wimbledon ran for three Championships and no longer runs, kept here because a reader watching a recording or reading a 2019 scoreline needs it. The fifth is the ITF’s own abbreviated set from Appendix VI.

Games won by Player A in this setGames in this set only. A tie-break counts as one game to the player who wins it, which is why a tie-break set can finish seven games to six.

Games won by Player B in this setAs for Player A. The page refuses a games score that the chosen format could not have produced — seven games to four, for instance, which would have ended at six games to four under every format here.

A seven-point tie-break decides this setExample

Six games all, in an ITF tie-break set

Five formats, and where each one stops being the same set

Four of the five rows are nearly identical and the differences sit in two cells each. That is the useful shape of this subject: a set format is not a different game, it is the same game with one threshold moved, and the threshold that moved is the only score at which two formats can disagree.
Format	Games to win the set	Tie-break at	Tie-break length	Published in
Tie-break set	Six, margin of two	Six games all	Seven points, margin of two	ITF Rules of Tennis 2026, Rules 5(b) and 6(a)
Advantage set	Six, margin of two	Never	—	ITF Rules of Tennis 2026, Rule 6(b)
Grand Slam deciding set, 2022 onward	Six, margin of two	Six games all	Ten points, margin of two	GST 2026 Official Grand Slam Rule Book, Article I Section L, with the game score from ITF Rule 6
Wimbledon deciding set, 2019 to 2021	Six, margin of two	Twelve games all	Seven points, margin of two	AELTC announcement of 19 October 2018
ITF short set	Four, margin of two	Four games all, or three games all at the sanctioning body’s discretion	Seven points, margin of two	ITF Rules of Tennis 2026, Appendix VI

The same games score, read under each format

Rows one to four are the agreement and row five is the divergence: one score, four answers, and nothing in the games tells you which. Rows six to nine show the other half of the same fact — a score that is routine under one format cannot have happened under another, so a scoreline carries information about which format was in force. Every cell is what the panel above returns for that format and those games.
Games	Tie-break set	Advantage set	Grand Slam deciding set	Wimbledon 2019–21
4–2	Still open	Still open	Still open	Still open
5–4	One game from the set	One game from the set	One game from the set	One game from the set
6–4	Set complete	Set complete	Set complete	Set complete
6–5	One game from the set	One game from the set	One game from the set	One game from the set
6–6	Seven-point tie-break	Play on, no tie-break	Ten-point tie-break	Play on to twelve games all
7–6	Set complete, tie-break won	One game from the set	Set complete, tie-break won	One game from the set
8–6	Impossible	Set complete	Impossible	Set complete
12–12	Impossible	Play on, no tie-break	Impossible	Seven-point tie-break
13–12	Impossible	One game from the set	Impossible	Set complete, tie-break won

One threshold moved, and five rule changes in four years

A set is the first to six games with a margin of two. That part has not changed and is in Rule 6 of the ITF Rules of Tennis 2026. What changes between competitions — and what changed at two of the four Grand Slam tournaments in 2019 and at three of them in 2022, five changes in four years — is what happens when the games reach six all. Rule 6 itself offers two answers: a tie-break set plays a tie-break there, and an advantage set has no tie-break at any score and runs until somebody leads by two games.

The advantage set is why the rest of this history exists. At Wimbledon in 2010 John Isner beat Nicolas Mahut with a final set of 70–68; in the 2018 semi-final Kevin Anderson beat Isner 26–24 in the deciding set. On 19 October 2018 the All England Lawn Tennis Club announced, through its chairman Philip Brook, that from 2019 “the tie-break will come into effect when the scores reach 12-12 in the final set”, won by “the first player to reach seven points with an advantage of two or more points”. Two months later the Australian Open’s tournament director Craig Tiley announced a different answer for 2019: “The final set will be decided after six-games-all with the longer of the tiebreak formats—first to 10 points.” The US Open had had a final-set tie-break since 1970, when the USTA introduced a nine-point sudden-death version in every set, and by 2018 it was the ordinary seven-point one at six games all. Roland-Garros had none: in December 2018 it was “the only major that does not employ a final-set tiebreak”.

So from 2019 to 2021 the four Grand Slam tournaments ran four different deciding-set rules at the same time, and a reader who knows one of them knows nothing about the other three. That ended in March 2022, when the Grand Slam Board announced a ten-point tie-break at six games all in the deciding set at all four, “based on a strong desire to create greater consistency in the rules of the game at the Grand Slams”, beginning at Roland-Garros 2022 and “first run on a trial basis”. It is now the standing rule: Article I Section L of Grand Slam Tennis’s 2026 Official Grand Slam Rule Book says the tie-breaks in the Rules of Tennis may be used in qualifying and the main events, “including the final set where a 10 point tie-break will be played”. Section L does not say at what games score, because that is ITF Rule 6’s six games all — the rule is spread across two documents and neither is complete on its own.

Two formats on this page are not deciding-set rules at all. The ITF’s short set, in Appendix VI, is the first to four games with a tie-break at four games all, or at three games all “at the discretion of the sanctioning body” — a format with a variant inside a variant. And the match tie-break, also in Appendix VI, is not a set in any sense: it “replaces the deciding final set” entirely, so there are no games to enter. Section 1.02.B.2 of the 2025 ATP Official Rulebook uses it in doubles — “two (2) tie-break sets with a deciding Match Tie-break (10 point) at one (1) set all”, with “Games shall be decided using the No-Ad scoring method” — so an ATP doubles match that goes the distance never plays a third set. For the match-level arithmetic of how many sets are left see the match score and sets interpreter, and for who serves which point once a tie-break starts, the tie-break serving order interpreter. Every rule quoted on this page is printed with the body that publishes it and the edition or year it belongs to. A tennis rule is a regulation rather than a fact: the deciding set was changed at two of the four Grand Slam tournaments in 2019 and at three of them in 2022, and in between those two years the four ran four different deciding-set rules at the same time.

Frequently asked questions

What is the tie-break rule in the final set at the Grand Slams?

A ten-point tie-break at six games all, at all four tournaments, since Roland-Garros 2022. Article I Section L of the 2026 Official Grand Slam Rule Book provides for the tie-breaks in the ITF Rules of Tennis “including the final set where a 10 point tie-break will be played”; the six-games-all trigger comes from ITF Rule 6. The Grand Slam Board announced it in March 2022 as a trial.

Why did Wimbledon play a tie-break at 12-12 and not at 6-6?

Because that was the compromise the All England Club chose in October 2018, when it replaced the advantage final set after Isner–Mahut’s 70–68 in 2010 and Anderson–Isner’s 26–24 in 2018. The rule ran for the 2019, 2020 and 2021 Championships — Djokovic beat Federer 13–12 in the 2019 final under it — and was replaced in 2022 by the ten-point tie-break at six games all that all four majors now use.

What is an advantage set?

A set with no tie-break at any score, ITF Rule 6(b): the first player to six games wins it provided they lead by two, and if neither leads by two the set simply continues. There is no upper bound, which is how a set reaches 70–68. Roland-Garros used it in the deciding set until 2022 and the Australian Open and Wimbledon until 2019.

Is a ten-point tie-break the same thing as a match tie-break?

Not quite, and the difference matters. A ten-point tie-break at six games all in a deciding set is played inside a set, and the set score ends seven games to six. A match tie-break under ITF Appendix VI “replaces the deciding final set” — it is played instead of a set, so there is no games score at all. ATP doubles uses the second kind at one set all, under Section 1.02.B.2 of the 2025 ATP Official Rulebook.

Can a set finish 8-6?

Only under a format with no tie-break at six games all. In an advantage set, yes. Under Wimbledon’s 2019 to 2021 deciding-set rule, yes, because the tie-break was at twelve games all. In an ordinary tie-break set, no: the set ends at seven games to six at the latest. So 8–6 in a scoreline tells you something about which format was in force.

Do the formats ever disagree below six games all?

No, with one exception on this page. The four six-game formats give identical readings at every score up to and including 6–5, and the table above shows that agreement explicitly. The ITF short set is the exception, because it needs four games rather than six, so a short set is already over at 4–2 where the others are still open.

Related calculators

References

International Tennis Federation. Rules of Tennis 2026, Rules 5, 6, 7 and 10. itftennis.com/media/7221/2026-rules-of-tennis-english.pdf. Rule 5(a), the standard game: Love, 15, 30, 40, “Deuce” at three points each, then “Advantage”. Rule 5(b), the tie-break game: first to seven with a margin of two; “The player whose turn it is to serve shall serve the first point”; “The following two points shall be served by the opponent(s)”; then two consecutive points each; and the player due to serve first becomes “the receiver in the first game of the following set”. Rule 6, the advantage set and the tie-break set. Rule 7, best of three or five. Rule 10: “During a tie-break game, players shall change ends after every six points.”
International Tennis Federation. Rules of Tennis 2026, Appendix VI — Alternative Procedures and Scoring Methods. No-Ad: at three points each “a deciding point shall be played”, with the receiver choosing the half of the court. Short sets: first to four games with a margin of two, a tie-break “if the score reaches four games all” or, “at the discretion of the sanctioning body”, at three games all. Match tie-break, seven or ten points: played at one set all, or two sets all in a best of five, and it “replaces the deciding final set”. Its own Change of Ends entry gives an alternative to Rule 10 — “after the first point and thereafter after every four points” — which is an approved option, not a replacement.
Grand Slam Tennis. 2026 Official Grand Slam Rule Book. itftennis.com/media/5986/grand-slam-rulebook-2026-f.pdf. Article I Section K: the ITF Rules of Tennis apply except where the Grand Slam rules say otherwise. Article I Section L: men’s singles main draw “shall be the best of five (5) sets”, everything else best of three “unless otherwise determined by each Grand Slam Tournament”, and the tie-breaks of the Rules of Tennis may be used “including the final set where a 10 point tie-break will be played”. Section L does NOT state the game score that starts it; that is six games all, from ITF Rule 6. Section C describes GST as a collaboration of the four tournaments.
The Week. “Wimbledon: final-set tie-breaks to be introduced in 2019”, theweek.com, 19 October 2018. The All England Lawn Tennis Club’s announcement, attributed to chairman Philip Brook: “the tie-break will come into effect when the scores reach 12-12 in the final set”, won by “the first player to reach seven points with an advantage of two or more points”, from 2019. It gives the two matches behind the change: Isner–Mahut in 2010, whose final set “finished 70-68”, and the 2018 semi-final in which Anderson won “the deciding set 26-24”.
Tennis Now. “Australian Open Adopts Final Set Tiebreaks”, tennisnow.com, 21 December 2018. “The final set will be decided after six-games-all with the longer of the tiebreak formats—first to 10 points”, announced by tournament director Craig Tiley for 2019. It records the other three majors at that date: Wimbledon’s “first-to-seven point final-set tiebreak when the score reaches 12-12”, the US Open’s “first-to-seven point final set tiebreak when the score is six-all”, and “Roland Garros is the only major that does not employ a final-set tiebreak”.
Tennis365. “Wimbledon and other three Grand Slams confirm uniformity as they will use 10-point tie-breaks in final set”, tennis365.com, 16 March 2022. A Grand Slam Board decision: “A 10-point tie-break will decide the final set at the Australian Open, French Open, Wimbledon and US Open”, which “will commence at the 2022 edition of Roland-Garros” and “will first run on a trial basis”, “based on a strong desire to create greater consistency in the rules of the game at the Grand Slams”. It states the four rules it replaced, one per tournament.
TNT Sports (published as Eurosport). “What are the new tie-break rules at Wimbledon this year?”, tntsports.co.uk, 1 July 2022. A second, independent account: “a 10-point tie-break has been introduced to decide all final sets when the score reaches 6-6”, the winner being “the first player(s) to win 10 points with an advantage of two or more points”. It confirms the Australian Open “has had first-to-10 points tie-breaks in the final set since January 2019” and that Wimbledon had “introduced a traditional tie-break after 12-12”, under which Djokovic beat Federer 13–12 in the 2019 final set.
Sokolowski A. “July 25, 1970: The day the USTA announced the introduction of the tiebreak”, tennismajors.com. The US Open adopted a “sudden-death nine-point tiebreak” at “six games all” in “every set”, first used at the 1970 championships, where “26 nine-point tiebreaks would be played on the very first day”. It credits the modern design to “Peter Jones, from the LTA” in 1975 and does not call it the twelve-point tie-break, so neither does this batch.
ATP. 2025 ATP Official Rulebook, Chapter 1 — ATP Circuit Regulations, Section 1.02.B. atptour.com/-/media/files/rulebook/2025/2025-rulebook-chapter-1_atp-circuit-regulations_20may.pdf. Singles (1.02.B.1): “the best of three (3) tie-break sets”. Doubles (1.02.B.2): “two (2) tie-break sets with a deciding Match Tie-break (10 point) at one (1) set all”, and “Games shall be decided using the No-Ad scoring method”. The file states no publication date and calls itself the 2025 rulebook at 1.07.A.1.