Tennis has one of the most charming and confusing scoring systems in all of sport. Newcomers watching their first match often wonder why the score jumps from 15 to 30 to 40, why zero is called love, and what on earth the umpire means by deuce. Once you understand the logic, though, the whole structure clicks into place. Here is a clear, jargon-free guide to how tennis scoring actually works, from the smallest point right up to match point.

Points Within a Game

The smallest unit of tennis scoring is the point, and points build up to win a game. Rather than counting one, two, three, tennis uses its own peculiar sequence. The progression runs like this:

  • 0 points — called love
  • 1 point — called 15
  • 2 points — called 30
  • 3 points — called 40
  • 4 points — wins the game, provided you are two points clear

The server's score is always announced first. So if the server has won two points and the receiver one, the umpire calls "30-15". If both players have won the same number of points, the umpire adds "all", as in "15-all" or "30-all".

Deuce and Advantage

Here is where many beginners get lost. A game cannot be won by a single point once both players reach 40. When the score is tied at 40-40, it is called deuce, and from that moment a player must win two points in a row to take the game.

Win the first point from deuce and you have the advantage. Win the next point too and the game is yours. But if you lose the point after gaining advantage, the score slides back to deuce, and the tug-of-war begins again. A single game can therefore swing back and forth through deuce many times before someone finally edges two points clear.

Games and Sets

Games in turn build up to win a set. To take a set, a player must win at least six games and be ahead by a margin of two. So 6-4 and 6-3 are winning scorelines, but 6-5 is not enough — you would need to press on to 7-5. If the set reaches 6-6, a tie-break is usually played to decide it.

Matches are then decided by winning a majority of sets. There are two common formats:

  • Best-of-three sets — the first player to win two sets takes the match. This is standard for most professional matches, including all women's singles.
  • Best-of-five sets — the first to win three sets wins. This longer format is used for men's singles at the four Grand Slam tournaments, producing some famously marathon encounters.

The Tie-Break

The tie-break was introduced to stop sets dragging on endlessly when neither player could pull two games clear. When a set reaches 6-6, players contest a tie-break instead of continuing game by game. In a standard tie-break, points are counted in plain numbers — one, two, three — and the first to reach seven points with a margin of at least two wins the set, which is then recorded as 7-6.

Players change ends during the tie-break, and the serve rotates between them in a set pattern rather than staying with one player. If the tie-break itself reaches 6-6, it simply continues until someone leads by two, so a tie-break can stretch well beyond seven points.

Final-Set Formats

For years the deciding set caused headaches, because some tournaments refused to use a tie-break in the final set. That meant the last set had to be won by two clear games, occasionally leading to enormous scorelines and matches lasting many hours. To bring consistency and protect players, the Grand Slams agreed on a shared solution.

Today, when the final set reaches 6-6, the major championships use a ten-point tie-break — sometimes called a match tie-break — where the first player to reach ten points, again by a margin of two, wins the whole match. This keeps thrilling finishes intact while preventing the never-ending deciders of the past.

Why Do We Say Love and Deuce?

The quirky vocabulary has roots stretching back centuries. The most popular explanation for love is that it derives from the French word l'oeuf, meaning "the egg", because a zero on the scoreboard resembles an egg — much like calling a score of nought a "duck's egg" in other games. Another theory suggests it comes from playing "for love", meaning for nothing rather than for money.

Deuce is thought to come from the French phrase a deux or deux du jeu, signalling that two consecutive points are still needed to settle the game. The origins of the 15-30-40 sequence are murkier, but a common theory links them to a clock face, with points marked at the quarter-hours; 45 was likely shortened to 40 over time for ease of calling.

Frequently Asked Questions

Why is zero called love in tennis?

The widely accepted explanation is that love comes from the French l'oeuf, "the egg", because the shape of a zero looks like an egg. An alternative theory holds that playing "for love" meant playing for no stakes, and the term simply stuck to describe a score of nothing.

What is the difference between a game, a set and a match?

A game is won by taking four points with a two-point margin. A set is won by taking at least six games with a two-point margin, usually settled by a tie-break at 6-6. A match is won by taking the majority of sets — two in a best-of-three, or three in a best-of-five.

What happens if a tie-break reaches 6-6?

Play simply continues. A standard tie-break is won at seven points, but only if a player is two points ahead. At 6-6 in the tie-break, players keep going until one of them leads by two, so the tie-break can extend well past seven.

Key Takeaways

  • Points run love, 15, 30, 40, and a game needs four points won by a two-point margin.
  • At 40-40 the game reaches deuce, and a player must win two points in a row to close it out.
  • Sets require six games won by two, with a tie-break usually deciding matters at 6-6.
  • Matches are best-of-three or best-of-five, with the majors now using a ten-point tie-break to settle the final set.