Key takeaways
- A game is won by the first side to reach at least four points with a margin of two, which is why deuce exists at three points each.
- A set is won by the first side to reach six games with a margin of two; at six games all, a tiebreak usually settles it.
- The server's score is always called first, which is the single fastest way to make a scoreboard readable.
- Best-of-three is the standard match length, with best-of-five reserved mainly for men's singles at the largest events.
- The margin-of-two rule is what makes tennis dramatic: no lead is structurally safe until the final point is actually won.
Tennis scoring looks arbitrary until you notice it is the same rule applied three times. At every level — points inside a game, games inside a set, sets inside a match — you must win by a clear margin, not just by one. Everything odd about the scoreboard follows from that.
A match is made of points, games and sets. Points build a game. Games build a set. Sets build the match.
Inside a game: love, 15, 30, 40, deuce
A game is a sequence of points played with the same player serving. It is won by the first side to win at least four points and hold a margin of two or more.
The calls are conventional rather than arithmetical. Zero is "love", one point is "15", two is "30", three is "40". Nobody is adding anything up; these are just the traditional names, and the game behaves identically if you count zero, one, two, three. The origin of the sequence is genuinely disputed, so treat any confident explanation of it with suspicion.
Two conventions make a scoreboard readable, and beginners trip on both:
- The server's score is called first, always. "30-15" means the server has two points and the returner has one. If you are ever lost, find out who is serving and the rest resolves itself.
- Tied scores get their own calls. One point each is "15 all", two each is "30 all". Three points each is not "40 all" — it is deuce.
Deuce is where the margin rule bites. At three points each, the next point cannot win the game, because winning it only produces a one-point lead. Instead the leader has advantage. Win the next point too and the game is theirs; lose it and the score returns to deuce. That loop can run indefinitely, which is why a single game occasionally lasts longer than some sets.
Inside a set: six games, by two
A set is won by the first side to win six games with a margin of at least two, so 6-4 and 7-5 are both finished sets and 6-5 is not.
If the set reaches six games each, a tiebreak is normally played to decide it. The tiebreak is a deliberate interruption of the format: it is scored in ordinary numbers rather than 15/30/40, it is won by the first to a target number of points with a two-point margin, and service alternates on a set pattern instead of staying with one player.
That structural change is the point of it. Without a tiebreak, a set between two good servers can continue until someone's legs fail. The tiebreak converts an open-ended contest into a bounded one, at the cost of deciding a set with a format that does not resemble the rest of the match.
Final sets are the place where formats still diverge most, and the rules have changed several times in living memory. Some competitions play a standard tiebreak, some play a longer one, and some historically played the final set out with no tiebreak at all. If you are watching an unfamiliar event, check the final-set rule before assuming.
Inside a match: best of three, best of five
Matches are best-of-three sets, where the first to two sets wins, or best-of-five, where the first to three does. Best-of-five is usually reserved for men's singles at the largest tournaments.
This is where the margin rule produces its most famous effect: a two-set lead is not a safe lead in a best-of-five, and a one-set lead is not a safe lead at all. There is no clock, no accumulated total carried between sets, and no credit for how comfortably you won earlier ones. A 6-0 set is worth exactly what a 7-6 set is worth.
That is unusual among scored sports. In a stroke-play golf tournament, every shot saved on Thursday is still in the bank on Sunday — the running total is the whole story, as golf scoring sets out. Tennis throws the total away at each boundary and starts again. It is why a player can win more points than their opponent across a match and still lose it.
Scoring a match you are not hitting every ball in
Any tennis game that is not a real-time sports title has to answer an awkward question: if the player is not striking every ball, what exactly is the scoreboard reporting?
Tennis Career Simulator 2026 answers it by keeping the scoring structure intact and compressing the decisions. Games, sets, deuce, advantage and tiebreaks all behave as described above. What changes is which points you are consulted on. Routine points resolve from your attributes, your style, your preparation and the opponent. The points that can swing a game or a set are handed to you, and you choose how to serve, return, defend or attack.
The compression is visible in one specific place, and it is fair to say so: a scoreline can move faster than it would in a real match. You will see a set close out in a handful of decisions rather than sixty-odd points. The structure is honest — a 7-5 set really did require seven games won by two — but the density of play behind it is not.
We took that deal deliberately. The alternative designs both failed in testing. Simulating every point with no input made the player a spectator. Asking for input on every point made a single tournament feel like work. Keeping the scoring rules exact while thinning the decision points was the version where a career remained playable across multiple seasons.
Deuce is the place where the compression shows least, incidentally, because a deuce game is already a sequence of high-leverage points. Those tend to come to you almost in full.
A quick reference
| Situation | What it is called | What it takes to win |
|---|---|---|
| No points | Love | — |
| One, two, three points | 15, 30, 40 | Four points with a two-point margin |
| Three points each | Deuce | Two consecutive points |
| One point up from deuce | Advantage | The next point |
| Games in a set | — | Six games, margin of two |
| Six games each | Tiebreak | Target points, margin of two |
| Sets in a match | — | Two (best of three) or three (best of five) |
Once the scoreboard makes sense, the tactical layer becomes visible: which points are actually worth something, and which style is best suited to winning them. Tennis playing styles covers the six approaches players take to that question.
For the studio's other rules and scoring explainers across sports, see sports GM.
Good to know
Frequently asked questions
Why does tennis score 15, 30, 40?
What is deuce?
How many games do you need to win a set?
How does a tiebreak work?
How long is a tennis match?
Sources
- Tennis scoring system (opens in a new tab)Wikipedia — accessed
- Glossary of tennis terms (opens in a new tab)Wikipedia — accessed
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