What Is Deuce in Tennis? Scoring Rules Fully Explained
Deuce in tennis is the score 40–40 in a single game, meaning both players are tied and either must win two consecutive points to take the game. It can repeat indefinitely until one player achieves that two-point lead.
Deuce in tennis is when a game reaches 40–40 — both players are tied and must now win two consecutive points to take the game. Winning the first point from deuce gives a player “advantage”; winning the second wins the game. If the player with advantage loses the next point, the score reverts to deuce, and the process repeats.
How Tennis Scoring Works Up to Deuce
Tennis uses an unusual point-naming system within a game:
| Points Won | Score Name |
|---|---|
| 0 | Love |
| 1 | 15 |
| 2 | 30 |
| 3 | 40 |
| 3 (tied) | Deuce (40–40) |
To win a game, a player normally needs four points. But if both players reach 40 (three points each), the game is tied at deuce — and a simple majority no longer applies.
What Happens After Deuce
Once deuce is reached, both players must earn a two-point lead to win the game:
- Deuce (40–40): Score is level.
- Advantage: One player wins a point. They now have “advantage” (sometimes called “ad”).
- Game: If the player with advantage wins the next point, they win the game.
- Back to deuce: If the player without advantage wins the next point, the score returns to deuce.
This cycle can continue for as many points as it takes. Exceptionally long deuce games — running 10, 15, or more points past the initial 40–40 — are not unheard of at the professional level.
Advantage In vs. Advantage Out
In informal usage, two phrases describe who holds the advantage:
- Ad in (or “advantage server”): The server holds the advantage.
- Ad out (or “advantage receiver”): The receiver holds the advantage.
These terms help players and spectators track who is one point from winning the game at any moment.
The No-Ad Rule
Some competitions — including certain doubles formats on the ATP and WTA tours, and many recreational leagues — use no-ad scoring. Under this rule:
- At 40–40, the next point wins the game outright.
- There is no advantage point and no returning to deuce.
- The receiving pair or player may choose which side to receive from.
No-ad scoring speeds up matches significantly and is often used in team competitions or formats where time is a factor.
Why Is It Called Deuce?
The word “deuce” is widely believed to derive from the French deux (two), reflecting the idea that a player needs two consecutive points to win from that tied position. Another theory links it to the old English deuce used in card games. The French origin is the most commonly cited explanation.
Deuce in a Tiebreak
Tiebreaks have their own scoring (counting up numerically: 1, 2, 3…) and do not use the word “deuce.” When a tiebreak reaches 6–6, a player must win by two clear points — which is structurally the same concept but referred to as 6-all, then 7–6, 8–7, and so on.
Quick summary: Deuce is the 40–40 tie within a game, requiring one player to win two consecutive points to take it. The player who wins the first post-deuce point holds advantage; if they win the next, the game is theirs. If not, it goes back to deuce — and can cycle indefinitely.
Frequently asked questions
What does deuce mean in tennis?+
Deuce means both players are tied at 40–40 in a game. From that point, one player must win two consecutive points to win the game — winning the first gives 'advantage,' and winning the next wins the game.
Can deuce happen more than once in a game?+
Yes. If a player has the advantage but loses the next point, the score returns to deuce. This can repeat indefinitely — there is no limit to how many times a game can go to deuce under traditional rules.
What is a no-ad scoring rule in tennis?+
In no-ad (no advantage) scoring, the first player to win the point at deuce wins the game outright. The receiver often gets to choose which side to receive from. This format is used in some doubles formats and recreational leagues to speed up play.