How Is Tennis Scored?

Tennis counts points in its own language. A player with zero points has "love," and from there points are called 15, 30, and 40 — the first point won makes the score 15, the second 30, the third 40, and a fourth point (with a two-point margin) wins the game.

The server's score is always called first. If the server has won two points and the receiver one, the umpire calls "30-15." When both players have the same score, it is announced as a tie: "15-all," "30-all," and so on.

Why 15, 30, 40 instead of 1, 2, 3? The most common explanation traces the numbers to a medieval clock face, with points marked at 15, 30, and 45 minutes; 40 is widely believed to be a shortening of 45 that left room for the deuce sequence. The history is debated, but the calling convention has been fixed for well over a century.

The point ladder is the foundation of everything above it. Points build games, games build sets, and sets decide the match — a four-level structure that makes tennis scoring feel layered compared with the single running tally of most sports.

When both players reach 40 — a score of 40-40 — it is called "deuce." From deuce, a player must win two points in a row to take the game. Win the first and you hold "advantage": the umpire calls "advantage" followed by the player's name, or "ad-in" when the server leads and "ad-out" when the receiver leads.

• Win the next point from advantage and you win the game.
• Lose the next point and the score returns to deuce.

A game can bounce between deuce and advantage many times; it only ends when one player is two points clear of the other. This is the game-level version of tennis's win-by-two principle, and it can make a single game last dozens of points.

No-ad scoring is a widely used shortcut. At deuce, the next point is a sudden-death, game-deciding point — no advantage, straight to game. Under the standard no-ad rule the receiver chooses which side to take the deciding point. No-ad is standard in ATP and WTA doubles and in college (NCAA) tennis, where it keeps match times predictable.

JudgeMate's live scoreboard has an advantage toggle — organizers can run classic advantage games or switch to no-ad sudden-death, so the scoreboard matches whatever format the event actually uses.

A set is won by the first player to reach six games with a lead of at least two games. So 6-4 and 6-3 win the set, but 6-5 does not — the leader must reach 7-5, or the set goes to 6-6.

What happens at 6-6? In almost all modern tennis, a tiebreak decides the set (covered in the next section). A few historical and exhibition formats used "advantage sets" with no tiebreak, where a set could run to 10-8, 24-22, or beyond — but the four Grand Slams and the professional tours have moved fully to tiebreaks.

How many sets decide a match?

• Best of three sets is the standard: the first player to win two sets wins the match. This covers almost all professional tennis, including ATP and WTA tour events and women's Grand Slam singles.
• Best of five sets — first to three sets — is used in men's singles at the four Grand Slams. It is the longest standard format in the sport.

Because every game is won by two points and every set by two games, tennis has two nested win-by-two margins before you even reach the match. That structure is why a player can win more total points than an opponent and still lose the match — points only matter within the game, set, and match they belong to.

The tiebreak was introduced in 1970, devised by Jimmy Van Alen to stop sets from running on indefinitely. It is played when a set reaches 6-6.

The standard seven-point tiebreak:

• The first player to seven points wins the tiebreak — and with it the set, at 7-6.
• A two-point margin is required, so 7-5 wins but a 7-6 lead in points does not — the tiebreak continues to 8-6, 9-7, and so on until someone leads by two.
• Points are counted 1, 2, 3… (not 15/30/40) inside the tiebreak.
• Serving rotates: the first server serves one point, then serve alternates every two points. Players change ends every six points.

The ten-point deciding-set tiebreak. Since 2022, all four Grand Slams have used a unified ten-point tiebreak to settle the final set when it reaches 6-6 — the Australian Open, Roland Garros, Wimbledon, and the US Open agreed on the same rule after years of different formats. The first player to ten points, win by two, takes the match. This longer tiebreak — sometimes called a "super tiebreak" — also replaces a full deciding set in most doubles. Earlier sets in the same match still use the seven-point tiebreak at 6-6.

JudgeMate's live scoreboard covers both: a tiebreak toggle at 6-6 and a separate final-set super-tiebreak toggle, so an organizer can score seven-point tiebreaks in early sets and a ten-point decider in the last set exactly as the pro game does.

Serving structure shapes how a tennis match is scored, so it is worth knowing the pattern.

One player serves an entire game. Unlike volleyball or pickleball, service does not pass point by point — a single player serves for the whole game, then the opponent serves the next game, alternating throughout the set.

Deuce court and ad court. Within a game, each point is served diagonally crosscourt. The first point of every game is served from the server's right side (the "deuce court"), the next from the left side (the "ad court"), and so on, alternating sides after each point. The names come from the score: the deuce point and the advantage point are always played from those respective courts.

Two serve attempts. The server gets a first serve and, if it misses, a second serve. Miss both and it is a double fault — an immediate point for the receiver. A serve that clips the net and lands in is a let and is replayed.

Changing ends. Players switch ends of the court after the first game, then after every two games (the odd-game changeovers: after games 1, 3, 5…). In a tiebreak, ends change every six points.

Who serves first is decided by a coin toss or racket spin: the winner chooses to serve, receive, pick an end, or defer the choice to the opponent. JudgeMate's scoreboard is run from a single phone, so one person taps the winner of each point and the games, sets, serve side, and tiebreaks update live for everyone watching.

Tennis is an objectively point-scored sport — there are no judges awarding marks for style. A point is won or lost by whether the ball lands in, is returned legally, and stays in play. That makes tennis a clean fit for a running scoreboard rather than a judging panel.

Who governs the rules. The International Tennis Federation (ITF) publishes the Rules of Tennis, the global standard. The ATP (men's tour) and WTA (women's tour) run the professional circuits and add their own competition regulations on top. The four Grand Slams — the Australian Open, Roland Garros (the French Open), Wimbledon, and the US Open — are the sport's biggest events and set much of the tone for format changes, like the unified deciding-set tiebreak.

Format variations you'll see:

• Best of five in men's Grand Slam singles; best of three almost everywhere else.
• No-ad games in most professional doubles and college tennis.
• A ten-point match tiebreak replacing a full third set in many doubles competitions.

Electronic line calling has largely replaced human line judges at the top level. Wimbledon adopted fully electronic line calling for the 2025 Championships, joining the two hard-court majors — the Australian Open and US Open — in automating in/out calls, while Roland Garros still uses human line judges on clay. This is sport context, not a JudgeMate feature — JudgeMate is a live scoreboard for tracking the score, not a line-calling, Hawk-Eye, or video-replay system. It records who won each point and computes games, sets, and tiebreaks; the in/out and let decisions on court are made by the players and officials, exactly as they always have been.