Tiebreak Serving Order Interpreter

One point, then two each, and ends after every six: the tie-break serving order is the most confusing exactly-computable thing in tennis. Enter the points and this says who serves next and whether the players change ends first.

Last updated 12 Oct 2026

Who serves the next point?

Rule 5(b) serving order

Points won by Player APoints in this tie-break only, counted numerically — Rule 5(b): “points are scored ‘Zero’, ‘1’, ‘2’, ‘3’, etc.” There is no 15, 30 or 40 inside a tie-break.

Points won by Player BAs for Player A. The serving order depends only on the TOTAL points played, so the split between the two players changes who has won and never changes whose turn it is.

Who served the first point of the tie-breakRule 5(b): “The player whose turn it is to serve shall serve the first point of the tie-break game.” There is no toss and no choice: whoever was due to serve the next game serves point one, and after a set reaching six games all that is the player who served the first game of the set.

Tie-break lengthBoth need a margin of two. Seven points is the ordinary tie-break game of Rule 5(b). Ten points is the Grand Slam deciding-set tie-break under Article I Section L of the 2026 Grand Slam Rule Book, and the length of the match tie-break in ITF Appendix VI that “replaces the deciding final set” and that ATP doubles plays at one set all.

Change of ends scheduleTaken as an input because the ITF publishes two. Rule 10: “During a tie-break game, players shall change ends after every six points.” Appendix VI’s Change of Ends entry gives an approved alternative — “after the first point and thereafter after every four points” — which applies only where a sanctioning body has adopted it. Rule 10 is the default here because it is the rule; the alternative is an option, not a replacement.

Change ends first; Player B serves the next pointExample

Three points each, Player A served the first point, a seven-point tie-break, ends after every six points

Who serves each point of a tie-break, and when the ends change

The server column repeats with period four — A, B, B, A, A, B, B, A — and the two schedules almost never coincide, which is why the schedule is an input rather than an assumption. Under Rule 10 the ends change before points 7 and 13; under Appendix VI’s alternative, before points 2, 6, 10 and 14. Both are published by the ITF and the second applies only where a sanctioning body has adopted it. Every row is what the panel above returns for that number of points played.
Point	Server (A served first)	Rule 10: change ends before it?	Appendix VI alternative: change ends before it?
1	A	No	No
2	B	No	Change
3	B	No	No
4	A	No	No
5	A	No	No
6	B	No	Change
7	B	Change	No
8	A	No	No
9	A	No	No
10	B	No	Change
11	B	No	No
12	A	No	No
13	A	Change	No

Which tie-break scores can exist

A tie-break is first-to-N with a margin of two, so the reachable finishing scores are N–0 through N–(N−2), and after that every pair exactly two apart — there is no upper bound. 10–8 is a perfectly ordinary end to a seven-point tie-break, reached by way of 8–8; 10–7 is not, because that one would have finished at 9–7. The pair of rows that matters is 8–5 and 10–7: a score impossible at one length and routine at the other, so a scoreboard carries information about which tie-break is being played. The panel above refuses the impossible ones rather than guessing whose turn it is in a state that never arose.
Score	Seven-point tie-break	Ten-point tie-break
6–5	Live — nobody has seven yet	Live
7–5	Complete. Seven points, margin of two	Live
7–6	Live — seven points, margin of one	Live
8–6	Complete	Live
8–5	Impossible. It would have ended at 7–5	Live
9–7	Complete	Live
10–7	Impossible. It would have ended at 9–7	Complete. Ten points, margin of three
10–8	Complete. Reached by way of 8–8, not by way of 9–7	Complete
11–8	Impossible	Impossible. It would have ended at 10–8

One point, then two each, and the arithmetic of it

Inside a tie-break the scoring stops being tennis scoring. Rule 5(b) of the ITF Rules of Tennis 2026 counts the points numerically — zero, one, two, three — with no love, 15, 30 or 40, and the game goes to the first player to seven with a margin of two. The serving order is the part people cannot hold in their heads: “The player whose turn it is to serve shall serve the first point of the tie-break game”, then “The following two points shall be served by the opponent(s)”, and after that each player serves two consecutive points. So it runs A, B, B, A, A, B, B, A — one point, then pairs — and it repeats with period four.

That is exactly computable and the panel computes it, because it depends on nothing except the number of points played. For the next point, numbered m, the player who served first serves it when m divided by two and rounded down is even: point 1 gives nought, point 2 gives one, points 4 and 5 both give two. The score itself is irrelevant to the serving order — it decides only whether the tie-break is over — which is worth saying because a scorer under pressure reaches for the score and not the total. Add the two point counts together and you have everything the order needs.

The change of ends is where the ITF publishes two answers, and this page takes it as an input rather than choosing quietly. Rule 10 says: “During a tie-break game, players shall change ends after every six points.” Appendix VI’s own Change of Ends entry gives an approved alternative — “after the first point and thereafter after every four points” — and an alternative in Appendix VI applies only where a sanctioning body has adopted it. The two schedules almost never coincide: Rule 10 changes before points 7 and 13, the alternative before points 2, 6, 10 and 14. Rule 10 is the default on this page because it is the rule. Either way the change is taken without a rest — the ninety seconds Rule 29(a) allows is for changing ends at the end of a game, not inside a tie-break.

Two consequences are worth carrying away. First, the tie-break counts as a single game, so Rule 5(b) makes the player who served its first point “the receiver in the first game of the following set” — the serving order carries over and does not restart, which is why a set that follows a tie-break begins with the other player serving. Second, a ten-point tie-break has the same serving order and the same ends schedule and simply runs longer: Article I Section L of Grand Slam Tennis’s 2026 Official Grand Slam Rule Book puts one in the deciding set at all four majors, and Appendix VI’s match tie-break “replaces the deciding final set” altogether — Section 1.02.B.2 of the 2025 ATP Official Rulebook uses that one in doubles at one set all. In those cases no set follows, so the rule about receiving first has nothing to apply to. 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. For which tie-break a given score calls for see the tie-break and set format interpreter, and for what a tie-break is worth as a probability, the game and set win probability calculator has the closed form for both lengths.

Frequently asked questions

Who serves first in a tennis tiebreak?

The player whose turn it was to serve anyway. Rule 5(b): “The player whose turn it is to serve shall serve the first point of the tie-break game.” After a set reaches six games all that is the player who served the first game of the set, because twelve games have been shared evenly. There is no toss.

What is the serving order in a tiebreak?

One point to the first server, then two consecutive points each: A, B, B, A, A, B, B, A and so on, repeating with period four. Rule 5(b) sets it out as the first point, then “The following two points shall be served by the opponent(s)”, then each serving “alternately for two consecutive points”.

When do players change ends in a tiebreak?

After every six points under Rule 10, so before points 7 and 13. ITF Appendix VI also publishes an approved alternative — after the first point and then after every four — which applies only where a sanctioning body has adopted it, so this page takes the schedule as an input. The change is taken without a rest either way.

Does a tiebreak score of 7-6 mean the tiebreak is over?

No. A tie-break needs a margin of two, so at 7–6 it is still live and continues until somebody leads by two: 8–6, 9–7 and onwards. 7–5 does end it, because seven points with a two-point margin is the whole condition. A score of 8–5 in a seven-point tie-break cannot have happened at all.

Who serves the first game of the set after a tiebreak?

The player who did NOT serve the tie-break’s first point. Rule 5(b) makes the player who was due to serve first in the tie-break “the receiver in the first game of the following set”, because the tie-break itself counts as one game, so the alternation simply carries on.

Is the serving order different in a ten-point match tiebreak?

No. The order and the ends schedule are those of a tie-break game — one point, then two each, ends after every six points under Rule 10 — and only the target changes, from seven points to ten. The panel above handles both: choose the length at the top. What does differ is that a match tie-break under Appendix VI “replaces the deciding final set”, so nothing follows it.

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.
International Tennis Federation. Rules of Tennis, 2009 edition, © ITF Limited 2009, in the PDF published by the Iowa Games at iowagames.org/wp-content/uploads/2017/08/USTA-Rules.pdf. Read as a SECOND, INDEPENDENT copy of Rule 1 and of the tie-break procedure, so that neither the court dimensions nor the serving order rests on one fetch of one edition — which matters most for the dimensions, because the 2026 edition’s court plan came back as a caption and is therefore an image. Seventeen years apart, every figure is identical, and so are the tie-break serving order and “change ends after every six points”.
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.
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.