🎾 Tennis, explained
Two players (or pairs) rally a ball over a net, scoring points when the opponent can't return it inside the lines.
What am I watching?
A tennis match is a duel built out of thousands of small exchanges. One player serves — hitting the ball diagonally into the opponent's service box — and the two then trade shots until someone misses, hits the net, or lands the ball outside the lines. Every exchange (a rally) is worth exactly one point, but points stack into games, games into sets, and sets into the match, so the same rally can be routine at 15-0 or heart-stopping at match point.
The central drama is serve versus return. The server has a huge advantage — a good first serve can win the point outright — so players are expected to win their own service games ("holding serve"). The match usually turns on the rare games a returner steals ("breaking serve"). When you hear commentators say a player is "a break up", it means they have won one more of the opponent's service games than they have lost of their own, which is often enough to take the set.
Watch for the surface too: tournaments are played on hard courts, clay, or grass, and each changes the game. Clay (like Roland-Garros in Paris) slows the ball and rewards long, grinding rallies; grass (Wimbledon) keeps the ball low and fast, favouring big servers; hard courts sit in between. Also notice the scoreboard rhythm — players change ends after odd-numbered games, sit down between them, and momentum can flip in seconds because tennis has no clock: you can't defend a lead, you have to finish the match.
How scoring works
Tennis scoring is a hierarchy: points make games, games make sets, sets make the match. Within a game, the server's score is always announced first, and points climb in the famous sequence love (0), 15, 30, 40, game. Win a point from 40 — with the opponent on 30 or less — and you win the game. If both players reach 40 the score is called deuce, and from deuce a player must win two points in a row: the first gives them advantage, the second wins the game. Lose the advantage point and the score returns to deuce, which is why single games can occasionally last ten minutes or more.
A set is won by the first player to reach six games with a margin of at least two (6-4, 7-5 and so on). If a set reaches 6-6, a tiebreak is played: players score ordinary numbers (1, 2, 3…), first to 7 points wins, but again with a two-point margin, so tiebreaks can run 10-8, 15-13 or beyond. The player who wins the tiebreak takes the set 7-6. Serving in a tiebreak alternates — one serve for the first point, then two serves each — and players change ends every six points.
Matches are best of three sets almost everywhere: the whole ATP and WTA tours, all women's Grand Slam matches, and doubles. The exception is men's singles at the four Grand Slams, which is best of five sets — one reason Slam matches can stretch past four or five hours. For the deciding final set, all four Grand Slams now use the same rule: at 6-6 in the final set, a 10-point match tiebreak is played (first to 10, win by 2) to settle the match. On the regular tour a deciding-set 6-6 uses the normal 7-point tiebreak, and in tour-level doubles the third set is replaced entirely by a 10-point match tiebreak.
A point itself is simple: you win it when your opponent fails to return the ball into your court — they hit it into the net, land it outside the lines, let it bounce twice, or fail to return your serve at all (an ace). The server gets two attempts per point; missing both is a double fault and the point goes to the returner. A ball landing on any part of the line is in.
- Points in a game run love (0) → 15 → 30 → 40 → game; the server's score is called first.
- At 40-40 (deuce) you must win two consecutive points — advantage, then the game.
- A set goes to the first player to 6 games with a 2-game cushion; 6-6 triggers a tiebreak (first to 7, win by 2).
- All four Grand Slams settle a 6-6 final set with a 10-point match tiebreak (first to 10, win by 2).
- Men's Grand Slam singles is best of five sets; everything else — WTA, ATP tour, doubles — is best of three.
- The server gets two serves per point; missing both is a double fault and loses the point.
- A ball touching any part of the line is in.
- An unreturned serve that the receiver never touches is an ace — a free point for the server.
Formats
Singles
Doubles
Mixed doubles
Best-of-five singles
Tiebreak Tens / exhibition
The rules
The court and equipment
Tennis is played on a rectangular court 78 feet (23.77 m) long, split by a net that is 3 feet (0.914 m) high at the centre. The singles court is 27 feet (8.23 m) wide; for doubles, side alleys widen it to 36 feet (10.97 m). Lines belong to the court they border, so any ball clipping a line is in. Courts come in three main surfaces — hard, clay, and grass — and the surface dramatically changes ball speed and bounce, which is why different players dominate different events.
The service boxes
The area between the net and the service line (21 feet from the net) is divided into two service boxes by a centre line. A serve must land in the box diagonally opposite the server — right (deuce) court first point, left (ad) court next, alternating every point.
Balls and racquets
Matches use pressurised felt-covered balls, replaced at regular intervals (typically after the first 7 games, then every 9) because they soften and fluff up with play. Racquet size and stringing are regulated by the ITF, but within limits players choose their own gear.
Serving
Every point starts with a serve. The server stands behind the baseline, alternating between the right and left halves of the court point by point, and must hit the ball into the diagonally opposite service box before it bounces on their own side. Two attempts are allowed: miss the first (a fault) and you serve a second; miss both and it's a double fault — the point goes to the receiver. Players serve entire games alternately: you serve one full game, your opponent serves the next, throughout the set.
Faults and lets
A serve is a fault if it lands outside the correct box, hits the net and lands out, or if the server steps on or over the baseline before striking the ball (a foot fault). If a serve clips the net cord but still lands in the correct box, it is a let — no fault is charged and the serve is simply replayed.
The serve clock
Professional tennis uses a 25-second shot clock between points. The server must start their motion before it expires; violations cost a warning, then loss of a first serve.
Playing a point
After the serve, players hit the ball back and forth. A shot may bounce once on your side before you return it, or you may hit it out of the air (a volley) — but never after a second bounce. You lose the point if your shot lands outside the lines, fails to clear the net, if the ball bounces twice on your side, if the ball touches your body or clothing, or if you touch the net while the ball is in play. There is no interference or blocking as in some sports — the players never occupy the same side of the net.
In or out
A ball is good if any part of it touches any part of the line. At most professional events, electronic line calling (Hawk-Eye or similar camera systems) now makes or reviews line calls, either replacing line judges entirely or via player challenges.
Games, deuce and advantage
A game is a race to four points scored as 15, 30, 40, game — with the twist that you must win it by two points. At 40-40, called deuce, the next point won gives that player advantage; win the following point and the game is yours, lose it and the score returns to deuce. There is no limit to how many times a game can return to deuce. Some doubles competitions use no-ad scoring, where the deuce point is sudden death and the receiving team chooses which side receives.
Sets and tiebreaks
The first player to win six games, leading by at least two, takes the set (6-0 through 7-5). At six games all, a tiebreak decides it: points count 1, 2, 3… and the first to 7 with a two-point margin wins the set 7-6. In the tiebreak, the player whose turn it is serves the first point from the deuce court, then serve alternates every two points, and players change ends every six points. Whoever received first in the tiebreak serves first in the next set.
Deciding-set rules
Since 2022 all four Grand Slams use a uniform rule: 6-6 in the final set triggers a 10-point match tiebreak — first to 10 points, win by 2. Regular tour events use a standard 7-point tiebreak at 6-6 in the decider. The days of endless final sets (like Isner–Mahut's 70-68 at Wimbledon 2010) are over.
Match formats
Best of three sets is the global standard: ATP and WTA tour singles, all women's matches everywhere, and doubles. Men's singles at the Australian Open, Roland-Garros, Wimbledon and the US Open is best of five sets — first to three. Tour-level doubles uses no-ad game scoring and replaces a deciding third set with a 10-point match tiebreak, keeping matches short. A match ends immediately when the required sets are won; there are no draws in tennis.
Changeovers, coaching and conduct
Players change ends after every odd-numbered game (1st, 3rd, 5th…) and sit for up to 90 seconds, with 120 seconds between sets. Limited coaching from the player's box is now permitted on both tours under specific conditions. The code of conduct penalises racquet abuse, ball abuse, audible obscenity and time-wasting on an escalating scale: warning, point penalty, then game penalty or default. Players may take a medical timeout for treatment and toilet breaks under strict time limits.
Doubles specifics
In doubles the full-width court (including the alleys) is in play after the serve, though the serve itself must still land in the normal service box. Each team sets a serving order for the whole set and a receiving formation (who takes deuce court, who takes ad court) that is fixed for the set. Either partner may hit any ball during a rally — but only the designated receiver may return the serve. Communication and net positioning matter more than raw power, which is why doubles specialists have long, late-blooming careers — India's Rohan Bopanna won his first Grand Slam men's doubles title at 43.
Officiating and technology
A chair umpire runs the match, announces the score and rules on the code of conduct. Electronic line calling has replaced or overrides human line judges at most top events, calling shots in real time or via player challenge with a video review shown on the big screen. The net-cord judge and service-let sensors detect serve lets. Players cannot argue judgement calls on ball marks where electronic calling is in use — the machine's word is final.
Glossary — 39 terms
Stats decoded
| Stat | Unit | What it tells you |
|---|---|---|
| First-serve % | % | The share of service points on which the first serve lands in. Around 60-65% is typical for top players; below 55% forces too many second serves, exposing the server to attack. |
| First-serve points won | % | Percentage of points won when the first serve goes in. Elite servers win 75%+ on hard courts and grass; combined with first-serve %, it tells you how dominant a player's serve really is. |
| Second-serve points won | % | Percentage of points won behind the second serve, where the server's advantage shrinks. Above 50% is strong; well below it means the player is effectively starting those points on defence. |
| Aces | count | Serves the opponent never touches. A raw power-and-placement metric — big servers can hit 15-25 per match, more in best-of-five — though ace counts depend heavily on surface speed. |
| Double faults | count | Points lost by missing both serves. A handful per match is normal; clusters of double faults, especially on break points, signal nerves or a breaking-down service motion. |
| Break points converted | won/faced (%) | How many of the break-point chances a player actually converted, e.g. 3/9 (33%). Around 40% is solid; a match can be lost while winning more total points if break points are squandered. |
| Break points saved | saved/faced (%) | The mirror stat for the server: how many break points against them they fought off. Saving 60-70% under pressure — often with clutch first serves — is the mark of a great server. |
| Winners | count | Clean point-ending shots the opponent couldn't touch. Read alongside unforced errors: a positive winners-minus-errors differential usually indicates controlled aggression rather than reckless hitting. |
| Unforced errors | count | Points given away by the player's own routine misses, as judged by the official scorer. The most-quoted quality stat; the winners-to-unforced-errors ratio summarises whether a player earned or donated the match. |
| Return points won | % | Percentage of points won when receiving serve. Even elite returners win only 35-45%, which is why breaks are precious; against first serves the number drops below 30%. |
| Net points won | won/attempted (%) | Success rate when a player comes forward to the net. Above 65-70% means approaches are well-chosen; a low rate suggests the player is getting passed or approaching off the wrong balls. |
| Total points won | count / % | All points won across the match. Because tennis scoring is hierarchical, a player can win more total points yet lose the match — the gap between total points and the result reveals how clutch the big moments were. |
| Average first-serve speed | km/h | Mean speed of first serves. Top men average around 185-200 km/h with peaks above 220; top women around 160-175. Raw speed matters less than placement, but it sets the returner's reaction window. |
| Average rally length | shots | Mean number of shots per point. Most points end within 4 shots even on clay; a rising average signals attritional baseline tennis, while a low one indicates serve-dominated, first-strike play. Neither is inherently better — it describes match style. |
Quick answers
Why does tennis scoring go 15, 30, 40 instead of 1, 2, 3?
The sequence is a medieval inheritance, most commonly traced to the quarters of a clock face — 15, 30, 45 — with 45 shortened to 40 over time. Whatever the true origin, the modern meaning is simple: 15 is one point, 30 is two, 40 is three, and the next point wins the game unless the score is tied at 40-40 (deuce), where a two-point margin is required. 'Love' for zero likely comes from the French 'l'oeuf' (the egg, shaped like a zero).
What is deuce and how does advantage work?
Deuce is the score when both players reach 40 in a game. From deuce, winning a point gives you 'advantage'; win the next point too and the game is yours. Lose the advantage point and the score resets to deuce, and this can repeat indefinitely — a single game must ultimately be won by two consecutive points from deuce. Some doubles events shortcut this with 'no-ad' scoring, where the deuce point is sudden death.
How does a tiebreak work in tennis?
When a set reaches 6-6, players contest a tiebreak scored in plain numbers. The first player to 7 points, leading by at least 2, wins the tiebreak and takes the set 7-6. One player serves the first point, then serve alternates every two points, and players swap ends every six points. If the score reaches 6-6 in the tiebreak, play continues until someone leads by two — 10-8, 13-11 and so on.
What is the 10-point match tiebreak at Grand Slams?
Since 2022, all four Grand Slams use the same deciding-set rule: if the final set reaches 6-6, a first-to-10-points tiebreak (win by 2) decides the entire match. Before this, each Slam had its own rule — Wimbledon played a tiebreak at 12-12, the French Open played on without limit — which produced marathons like the 70-68 fifth set at Wimbledon in 2010. The same 10-point format also replaces the third set in regular tour doubles matches.
How many sets do you need to win a tennis match?
Almost all professional tennis is best of three sets — you need two. The exception is men's singles at the four Grand Slams (Australian Open, Roland-Garros, Wimbledon, US Open), which is best of five, requiring three sets to win. Women play best of three everywhere, as do doubles teams. A set goes to the first player to win six games with a two-game lead, or 7-6 via tiebreak.
What does it mean to break serve, and why is it such a big deal?
Breaking serve means winning a game your opponent served. Because the server controls the first shot of every point, professionals win the large majority of their service games — so a single break often decides an entire set. A 'break point' is any point where the returner is one point from winning the server's game; matches frequently hinge on a handful of these moments, which is why break-point conversion is so closely tracked.
What is the difference between a walkover and a retirement?
A walkover happens when a player withdraws before the match starts — the opponent advances without hitting a ball and no score is recorded. A retirement happens mid-match, when a player stops due to injury or illness; the score at that moment stands and the opponent wins. Both count as advancing to the next round, but statistically they are treated differently.
What are the four Grand Slams and how are they different?
The Australian Open (January, hard court), Roland-Garros/French Open (May-June, clay), Wimbledon (June-July, grass) and the US Open (August-September, hard court). Each surface changes the tennis: clay rewards endurance and topspin, grass rewards serving and low slices, hard courts are the neutral ground. They are the sport's biggest events for prize money, ranking points and prestige, and men's singles at Slams uniquely uses best-of-five sets.
Why do some tennis matches last five hours and others one hour?
Tennis has no clock — a match ends only when the required sets are won, so length depends on format and competitiveness. A one-sided best-of-three can finish in under an hour, while a five-set Grand Slam battle with tiebreaks and long deuce games can pass five hours. Surface matters too: clay's slower rallies stretch matches, while quick grass-court points shorten them. The 2012 Australian Open final (Djokovic d. Nadal, 5h 53m) remains the longest Slam final.
Has India won anything big in tennis?
India's greatest successes have come in doubles: Leander Paes and Mahesh Bhupathi won multiple Grand Slam doubles titles, Sania Mirza won six major titles across women's and mixed doubles and reached world No. 1 in doubles, and Rohan Bopanna won the 2024 Australian Open men's doubles at age 43, becoming the oldest first-time Slam champion in men's doubles. Paes also won a singles bronze at the 1996 Atlanta Olympics, and India has a long Davis Cup tradition, reaching the final three times.