What Is Deuce in Tennis? Advantage, Ad In, Ad Out and No-Ad Scoring Explained

Tennis rules · Scoring · Updated 2026-09-08

Deuce is the score you reach when both sides have won three points in the same game. It is called out as deuce rather than 40-40, and it changes what winning the game takes. From that moment nobody can end the game by reaching the next number. You have to win two points in a row.

This guide covers deuce and advantage, the ad in and ad out calls, which side each of those points is played from, how often one game can return to deuce, and no-ad scoring, the shortened alternative used in Fast4 and in many college, junior and club competitions. For the earlier part of a game, start with how tennis scoring works or the guide to love, 15, 30 and 40.

What deuce actually is

A game is scored love, 15, 30, 40, game. The fourth point wins the game only when the other side has 30 or fewer. When both sides reach 40 the score is deuce, and the requirement changes to a margin of two clear points. Deuce is less a number than a state: the sides are level, and neither can finish the game with a single point.

The word covers more than the first 40-40. Every later tie in the same game is deuce again. If the score goes to advantage and the trailing side wins the next point, you are back at deuce, whether that is the second time or the ninth. There is no 45-45 and no second 40-40. Any tie at three points or more is simply deuce.

Advantage, and how one lost point undoes it

Win the point after deuce and you hold the advantage. Advantage is one point from the game: win the next point too and the game is yours. Lose it and the score returns to deuce, with the two point requirement reset in full. An advantage is never banked or carried forward. The only thing that ends the game is two consecutive points from deuce.

• Win the point after deuce and the score is advantage to you.
• Win the next point as well and you win the game.
• Lose the next point and the score goes back to deuce, with neither side holding anything.
• Nothing in the rules limits how many times that can repeat inside one game.

Ad in and ad out

Ad in and ad out are those same two situations described from the server's point of view, and they are the calls you will hear most in club and junior tennis. Ad in means the server holds the advantage. Ad out means the receiver holds it. The shorthand is spoken from the server's side because the server calls the score, so in means the advantage belongs to the server and out means it belongs to the far end.

The longer forms, advantage server and advantage receiver, are equally correct, and in doubles many players use advantage plus a name. What matters is that both ends hear the same thing, so say it before you start the point rather than after it. Keeping score at a junior match covers who calls what when there is no umpire.

A deuce game, point by point

The table below follows one game from its first deuce. Read it as a loop rather than a list: every advantage either ends the game or drops the score back to the row above it.

Two things fall out of that. A game that has gone to deuce can only be won on an even total of points played, because the winning point always follows an advantage, and it is the point that takes an odd total back to an even one. That same arithmetic makes every deuce an even total and every advantage an odd one, which is what fixes the side each point is played from.

Which court deuce and advantage are played from

The side is not a choice, it is arithmetic. Every game opens with the server standing to the right of the center mark and serving diagonally into the deuce court. After that the sides alternate on every point: the point is played from the deuce court when the number of points already played is even, and from the ad court when it is odd.

That single rule makes deuce and advantage predictable. Deuce is six points played, or eight, or ten, always even, so every deuce point is served from the deuce court. Advantage is seven points played, or nine, or eleven, always odd, so every advantage point is served from the ad court. That is where the ad court gets its name.

How long a deuce game can run

There is no cap. Under advantage scoring the game ends when one side wins two points in a row from deuce, and until that happens the score can return to deuce as many times as the players manage. Nothing awards the game after a set number of deuces, and no clock runs against the game itself.

Marathon games are part of the folklore of the sport, and commentators often count the deuces out loud during one. That count is a curiosity, not a rule. What a long game does change is real enough: it is physically expensive for both players, and it can push a set past the length either side planned for. That second problem is what no-ad scoring was invented to solve.

No-ad scoring: one deciding point

No-ad scoring removes advantage entirely. Points are still scored 15, 30, 40, but the game is a race to four points, and when the score reaches three points each, still called deuce, a single deciding point settles it. Whoever wins that point wins the game. Some leagues announce it as a deciding point and others as sudden death; they mean the same thing.

The server has no choice to make and keeps serving as normal. The choice belongs to the receiver, who decides whether to take the deciding point in the deuce court or the ad court, whatever the point total would otherwise dictate. In singles that is one player's call. In doubles the pair chooses the side together, and because the partners may not change positions for the deciding point, that choice is what settles which of them receives it.

1. Reach three points each: The score is called deuce, exactly as it would be under advantage scoring.
2. Say that it is the deciding point: Call deciding point, or sudden death, out loud so both ends agree the game ends on this one.
3. The receiver chooses the side: The receiver, or the receiving pair in doubles, picks the deuce court or the ad court, and the server serves to the side chosen. A doubles pair may not swap positions to take it, so the side it picks is the partner it picks.
4. Play the point: The winner of the point wins the game. There is no advantage, no second chance and no return to deuce.

In mixed doubles the deciding point is played same-sex: a man serves to a man and a woman serves to a woman. The receiving pair still may not change positions, so the same-sex requirement is what settles which side the point is played from rather than the pair rearranging itself around the server, as the doubles serving order guide explains.

Let a rules engine hold the score. Tennis Score Keeper₊ scores deuce, advantage and no-ad as rules rather than as a running tally, so it always knows whether the next point is a deuce court point or an ad court point and whether the format you chose ends the game with a deciding point. Undo runs back to the first point of the match if a call needs fixing. Learn more about Tennis Score Keeper₊.

Where no-ad scoring is used

No-ad is an alternative scoring method that an event has to adopt, so it applies only when the competition says it does. You will meet it in these places most often.

• Fast4, where every game is no-ad, sets are the first to four games, and a tiebreak to five is played at 3-3.
• College and university dual match doubles, where a no-ad set is the standard format; dual match singles scoring varies by division and conference, so check the rules for the event.
• Many junior tournament and academy formats, where a full draw has to finish inside a day.
• Club leagues, box leagues and social ladders built around court bookings of a fixed length.
• A good deal of high level doubles, usually paired with a match tiebreak in place of a deciding set.

Formats mix these pieces freely, and the combination in use is normally printed on the draw sheet or in the league rules. Tennis match formats explained sets the common ones out side by side, including the events where a match tiebreak replaces a third set.

How no-ad changes a match

A no-ad game can never run past seven points, so the worst case for a game is fixed, and with it the worst case for a set and for the match. That predictability is the point. A tournament desk can plan court time, a league night can finish, and a junior draw survives one long game.

It also changes how the tennis feels. Under advantage scoring a server who keeps reaching deuce still has an edge, because a break needs two clean points in a row. Under no-ad a break needs one, so serve is easier to break and a single point carries far more weight. Know which version you are playing before the first game rather than during the fourth.

Mistakes worth avoiding at deuce

• Calling 40-40 on the second and every later tie. From three points each onwards, every tie is deuce.
• Calling the score after the ball toss instead of before it. The server announces it loudly enough for the far end, then serves.
• Serving an advantage point from the deuce court. An advantage point is always played from the ad court.
• Treating an advantage as a lead you keep. Lose the next point and it is gone.
• Assuming no-ad applies because the last event used it. Ask before the match starts.
• Forgetting the same-sex rule on a mixed doubles deciding point, the most commonly missed rule in the format.

The short version

Deuce is a level score at three points or more, played from the deuce court. Win one point from there and you hold the advantage, played from the ad court. Win the next and the game is yours; lose it and you are back at deuce with nothing gained, as often as it takes. Under no-ad that loop becomes one deciding point with the receiver choosing the side, played same-sex in mixed doubles. Everything else, including who serves and when you change ends, carries on unchanged.

Frequently asked questions

What does deuce mean in tennis?

Deuce is the score when both sides have won at least three points in the same game and are level, starting at 40-40. From deuce the game can only be won by two clear points in a row. Every later tie in that game is called deuce again, so a long game can pass through deuce many times.

What is the difference between ad in and ad out?

Ad in means the server holds the advantage and ad out means the receiver holds it. Both calls are spoken from the server's point of view because the server calls the score. The longer forms, advantage server and advantage receiver, mean exactly the same thing.

How many times can a tennis game go back to deuce?

There is no limit. A game returns to deuce every time the player holding the advantage loses the next point, and the rules place no cap on how often that can happen. The game ends only when one side wins two consecutive points from deuce, or immediately on a deciding point if the format uses no-ad scoring.

What is no-ad scoring in tennis?

No-ad scoring replaces advantage with a single deciding point at three points each, so a game can never last more than seven points. The receiver chooses whether to take that point in the deuce court or the ad court, and the server serves to the side chosen. It is standard in Fast4 and in college dual match doubles, and it is widely used in junior formats and club leagues.

Which side do you serve from at deuce?

Deuce points are served from the deuce court, the server's right, and advantage points from the ad court, the server's left. The side follows the point total rather than the call: an even number of points played means the deuce court, an odd number means the ad court. Deuce is always an even total and advantage is always odd.

How does deuce work in doubles?

Deuce and advantage work the same way in doubles as in singles, and the receiver is whichever partner is due to take that court under the receiving order fixed at the start of the set. The one exception is a no-ad deciding point, where the receiving pair chooses which half of the court to receive from. The partners may not change positions to take it, so that choice of side is what decides which of them receives. In mixed doubles the deciding point is played same-sex, and since the pair cannot rearrange itself, that requirement settles the side for them.

Keep reading

• How Tennis Scoring Works: Points, Games, Sets and Matches Explained
• Tennis Scoring Terms Explained: Love, 15, 30, 40 and the Words You Hear Courtside
• Tennis Match Formats Explained: Best of 3, Best of 5, Pro Set, Fast4 and Short Sets