A match can look almost finished at 6–6, then turn into a sprint where every serve matters. At the Australian Open, the tiebreak rules depend on whether the players are settling an ordinary set or the deciding set—and that difference can shape the whole match.
The quick version
When a set reaches 6–6, the players play a tiebreak. In a regular set, the first player to reach seven points, with a margin of at least two, wins the tiebreak and the set. In the deciding set of a singles match, the first player to reach 10 points, again by two, wins the match.
So 7–6 is not always the end of the contest. If a deciding-set tiebreak is 9–9, play continues until someone leads by two: 11–9, 12–10, and so on.
Australian Open tiebreak rules at a glance
| Situation | What happens at 6–6? | How to win |
|---|---|---|
| Regular set in singles | A standard tiebreak | Reach at least 7 points and lead by 2 |
| Deciding set in singles | A 10-point match tiebreak | Reach at least 10 points and lead by 2 |
| Deciding set in doubles | A 10-point match tiebreak replaces the full set | Reach at least 10 points and lead by 2 |
How a regular tiebreak works
Players do not use the familiar love, 15, 30, 40 scoring sequence in a tiebreak. Points are counted as 1, 2, 3 and onward. For example, a player who wins the first four points leads 4–0.
The serve changes in a set pattern. The player due to serve starts with one point. The opponent serves the next two, then the first player serves two, and the pattern continues in pairs. In shorthand, the order is one point, two points, two points, two points, and so on. The first point is served from the deuce court; players alternate serving sides after each point.
Players change ends after every six points. This matters in Melbourne, where sun, wind and court conditions can feel different from one end to the other. A player might begin a tiebreak serving into the wind, then switch ends while the score is still close.
A simple example
Suppose the score is 6–6 in the second set. The tiebreak reaches 6–6, then one player wins the next point to go ahead 7–6. That is not enough to win: the other player can level it at 7–7. If the first player then wins two points in a row, the tiebreak ends 9–7 and the set score becomes 7–6.
In match results, the number in parentheses often shows the tiebreak score. A set won 7–6 after a 9–7 tiebreak may be shown as 7–6(7), though scorekeeping formats can differ.
The deciding-set tiebreak: first to 10
At 6–6 in the deciding set of a singles match, the Australian Open uses a 10-point tiebreak. It follows the same service pattern and end changes as a regular tiebreak, but players must reach 10 points and win by two.
For example, if the score is 9–9, the match is still alive. A player who wins the next point leads 10–9, but needs one more point to close it out. If the opponent makes it 10–10, play carries on until there is a two-point gap.
This rule applies regardless of whether the deciding set is the third set in a women’s singles match or the fifth set in a men’s singles match. The set score is recorded as 7–6, with the tiebreak score often included in parentheses—for instance, 7–6(10–8).
What about doubles?
In Australian Open doubles, the first two sets use standard set tiebreaks at 6–6. If the match reaches a deciding set, a 10-point match tiebreak replaces a full third set. The team that reaches 10 points first with a two-point lead wins the match.
That is an important distinction: in singles, players play a deciding set up to 6–6 before the 10-point tiebreak; in doubles, the match tiebreak takes the place of the deciding set itself.
Why the rule matters tactically
A standard tiebreak rewards a strong run, but a 10-point decider gives players a little more room to recover from a bad start. Neither format is forgiving for long. A double fault, a missed return, or one nervy second serve can quickly change the balance.
Serving order becomes especially important. The player serving the first point has only one serve before the opponent gets two consecutive points on serve. Players often aim to make a high percentage of first serves, but they also need to avoid becoming predictable. A well-placed serve followed by an aggressive first groundstroke can be safer than simply trying to blast an unreturnable ace.
For the returner, the first point is a useful chance to apply pressure before the server settles into a two-point sequence. On the return, getting the ball deep and making the opponent play an extra shot can matter more than going for a spectacular winner. In a 10-point decider, patience can be just as valuable as aggression: a player who is 5–8 down has not lost, but needs to win points in a row to turn the score around.
When did the Australian Open adopt this format?
The Australian Open introduced a 10-point tiebreak for the deciding set in 2019. In 2022, the Grand Slam tournaments agreed on a shared approach: a 10-point deciding-set tiebreak at 6–6. That replaced the different deciding-set procedures the majors had previously used.
The change puts a limit on how long a match can continue after reaching 6–6 in the final set. It also means fans watching the majors can expect the same basic deciding-set rule, even though the normal scoring and match formats differ across events.
Frequently Asked Questions
Does a tiebreak start at 6–5?
No. A set tiebreak begins when the score reaches 6–6. At 6–5, the player ahead needs to win one more game to take the set.
Does the player who reaches 7 or 10 automatically win?
Not necessarily. The player must also lead by two points. A 7–6 score in a regular tiebreak or 10–9 in a deciding-set tiebreak is not enough.
Do players change ends during a tiebreak?
Yes. They change ends after every six points, including in the 10-point deciding tiebreak.
Is the Australian Open deciding-set rule different for singles and doubles?
The scoring target is the same: at least 10 points and a two-point lead. In singles, the tiebreak begins at 6–6 in the final set. In doubles, a 10-point match tiebreak replaces the deciding set.
Final Thoughts
The key to following an Australian Open tiebreak is to check whether it is an ordinary set or the deciding set. The regular version is first to seven by two; the singles decider is first to 10 by two. Once the score gets tight, remember that reaching the target number is not enough—you still need that two-point cushion.
