French Open explained: clay, roofs and night sessions

The groundstaff at Roland-Garros walk onto a wet court carrying rakes, not blowers. That difference tells you most of what separates this fortnight from the rest of the calendar. The French Open, explained by its own materials, is a tournament built on a surface that has to be watered, rolled, swept and repaired between sessions, and almost every argument the event has with itself comes back to that.

Here is the short answer for anyone who wants it before the detail. Roland-Garros is the second major of the year, staged in the sixteenth arrondissement of Paris across fifteen days from late May into early June. Both singles draws hold 128 players. Men play the best of five sets, women the best of three, and since 2022 a deciding set that reaches six games all is decided by a tie-break to ten points. The courts are crushed brick over compacted limestone, which is the slowest common surface in professional tennis and the reason the tournament rewards a particular kind of player so relentlessly.

That is the format. The rest of this piece is about why the format produces the tennis it does, and about the four arguments the tournament is currently having: over its roofs, over who plays in the evening, over who gets handed a place, and over whether a surface this distinct is still fair.

What the red dust actually sits on

Almost every description of the surface stops at the words "red clay", which is misleading in two directions at once. There is no clay in it, and the red part is barely there.

A Roland-Garros court is five layers deep. At the bottom sits a bed of drainage stone. Above that, crushed gravel. Above that, a layer of clinker, the coal aggregate left over from industrial burning, which gives the structure both stability and a route for water to travel. Then comes the layer that matters: white limestone, compacted to a hard, level slab. Only on top of all of it goes the crushed red brick, and that dressing is a few millimetres thick at most.

So the bounce is set by the limestone, and the behaviour of the ball across the ground is set by the brick dust. A player sliding into a forehand is sliding on the loose top layer. A ball kicking up to shoulder height is doing so because it met a hard surface under that layer at a steep enough angle to be thrown upwards rather than driven forwards.

This is also why the courts need constant attention. The top dressing migrates. It piles up behind the baseline where feet drag, thins out in the service boxes where the ball lands, and washes into ridges after rain. The sweeping between sets is not decoration for the cameras. A court whose dressing has gone uneven plays unevenly, and the players notice within two games.

• 128Players in each singles main draw
• 8Wildcards available in each singles draw
• 2Courts fitted with a retractable roof
• 15Days of main-draw play

Draw and site figures set by the Grand Slam rules and by the tournament's own published court list. Not performance data.

Why the surface changes what a rally is for

Take the same shot, hit at the same speed with the same spin, and land it on acrylic and on brick dust. The acrylic returns most of the forward speed and a little of the height. The brick dust does the reverse. Friction strips speed out of the contact, and the steeper rebound angle sends the ball upwards instead.

Two consequences follow, and everything else about clay tennis is downstream of them.

The first is that the ball arrives later and higher. A player who would be hitting at hip height on a hard court is taking the same ball above the shoulder, where a flat drive is difficult and a heavily brushed topspin shot is natural. Grips that suit high contact points do well here. Grips that suit low, flat, early contact do badly, and no amount of practice hours fixes the geometry.

The second is that the defender gets an extra tenth of a second, over and over. On a fast surface a good approach shot ends the point because the opponent cannot get there. On brick dust the opponent gets there, and gets there balanced, because the sliding step costs less energy than a stopping step. Winners that would end rallies elsewhere merely start another exchange, and the player who lacks the lungs for that exchange loses.

The consequence for tactics is that patience stops being a virtue and becomes a requirement. A point is constructed rather than won: pushed wide, dragged back, worked until an opponent is a metre out of position and the court finally opens. Anyone who has read about what changes between clay, grass and hard courts will recognise the mechanism; what Roland-Garros adds is a fortnight of it at best-of-five length, in cold Parisian air that makes the balls heavier still.

The ninety-two years without a roof

For most of its life this tournament had no answer to rain beyond waiting. Roland-Garros has been played at the Porte d'Auteuil site since 1928, and Court Philippe-Chatrier did not gain a retractable roof until the 2020 edition. That is a very long time to run a fortnight in northern European spring with no contingency, and it shaped the event's character in ways that survive the roof.

Wet weeks at Roland-Garros used to compress the schedule until it buckled. Matches were pushed to the following day, then stacked three deep on the show courts, then split across sessions. A player could find themselves playing on four consecutive days late in the second week while an opponent on the other half of the draw had rested. The tournament's own record of matches finishing in near-darkness comes from that period, because floodlights were not installed across the site until the same renovation programme that brought the roof.

The engineering answer, when it finally arrived, was substantial. The Chatrier roof weighs around 3,500 tonnes, covers roughly 10,000 square metres, and closes in about fifteen minutes. It is built from a set of trusses that carry fabric panels, which slide over the bowl rather than folding into it.

The operating rules matter more than the specification. The referee decides, and decides for the whole match rather than point by point. Before the first match of the day the referee reads the forecast and sets the roof open or closed; whatever is chosen stands until that match finishes. If a shower arrives mid-match the covers go on first, as they do on every court, and only if the rain settles in does the referee order the roof shut. Once it is shut, the lights go on, because a covered bowl needs artificial light even at midday.

Two roofs, and the scheduling problem they only half solve

Court Suzanne-Lenglen received its own retractable roof for the 2024 tournament, designed by Dominique Perrault with a woven canopy that nods to the pleated skirt Jean Patou made for the player the court is named after. It closes on a similar timescale to the Chatrier structure.

Two roofs are better than one, and they are still not many. Roland-Garros runs main-draw matches across a dozen or more courts on the busy early days, and the other courts have nothing but tarpaulins. So a wet first week still costs the tournament almost as much play as it ever did. What the roofs buy is not a rainproof tournament; it is a guaranteed television product and a guaranteed finish to the matches that sell the most tickets.

That distinction produces its own unfairness, and players raise it every year. Two competitors in the same round can play in completely different conditions on the same afternoon: one indoors under lights on a dry court with a lively ball, the other outdoors on a damp court where the ball picks up moisture and stops travelling. Neither is cheating anybody. It is simply what happens when a tournament covers a fraction of its courts and has to keep going.

81%13%

• Direct acceptances by ranking104
• Qualifiers16
• Wildcards8

The standard Grand Slam composition. Direct acceptances are the players whose ranking on the entry deadline was high enough for a place.

Show the numbers

Where the 128 places in a singles draw come from

Item	Value
Direct acceptances by ranking	104
Qualifiers	16
Wildcards	8

The night session: what it is and how it came about

The 2020 renovation put floodlights on twelve courts, including the three main show courts. No night matches were scheduled that year. From 2021 the tournament introduced a ticketed evening session on Court Philippe-Chatrier, initially starting at 9pm and later moved earlier to 8.15pm, running from the first Monday through to the middle of the second week.

The session is a distinct product, not an extension of the day. It has its own ticket, its own crowd, and, in France, its own broadcaster: the evening match is carried by Amazon Prime under a rights deal that stipulates a single match in the slot. That last clause is the load-bearing one, and it explains a lot of what follows. One match means one choice, made in public, every night for eleven nights.

For the tournament the commercial logic is straightforward. A Parisian audience that cannot leave work at two in the afternoon can arrive at eight, the stadium fills, the broadcast lands in prime time, and a fortnight with a fixed number of playable hours gains a saleable session at the end of each day.

The night session row, stated fairly

Through the 2025 tournament, fifty-two night sessions had been staged since the format began in 2021. Four of them featured a women's match. In 2025 the count was zero: all eleven evening matches were men's.

The organisers' defence has been consistent. A men's match is the best of five sets and therefore cannot finish inside two, while a women's match is the best of three and can be over in under an hour. Someone paying a premium for a single-match evening ticket, the argument runs, is better served by the format that guarantees more tennis. Tournament director Amélie Mauresmo has stated plainly that the reasoning is about match length rather than any judgement of quality.

The counter-argument has been made repeatedly by players. Ons Jabeur has pointed out that the audience data used to justify the choice is produced by the choice: schedule men in prime time for years and the viewing figures will say audiences prefer men in prime time. Aryna Sabalenka has framed it as a straightforward matter of stage and timing rather than of merit.

There are two ways to read the impasse, and they are not mutually exclusive. One is that a single-match session is structurally hostile to best-of-three tennis, and that the fix is to schedule two matches or to spread the evening across both roofed courts, which Mauresmo has publicly discussed as an option now that Suzanne-Lenglen is covered. The other is that a tournament choosing eleven marquee matches every year, and choosing men in almost all of them, is making a statement about billing whatever its stated reasons. Both readings survive contact with the numbers.

What the row is genuinely not about is prize money. Roland-Garros pays equal singles prize money, as all four majors do. The dispute is about scheduling, which is the resource that equal prize money does not touch.

Men's singles48

Women's singles4

Counts of evening-session matches staged from the format's introduction in 2021 through the 2025 tournament, as reported during the 2025 event.

Show the numbers

Night sessions on Court Philippe-Chatrier by draw, 2021 to 2025

Item	Night sessions
Men's singles	48
Women's singles	4

Qualifying: a second tournament in the week before

Sixteen of the 128 places in each singles draw are not allocated by ranking at all. They are won in a qualifying event played on the site in the week before the main draw begins, and understanding it changes how you read the first round.

A qualifier has played three matches, on these courts, in these conditions, in the days immediately before the main draw. Their opponent in the first round has usually played none, and may have arrived from a different surface entirely. The seeding system treats a qualifier as an unknown, but a qualifier at Roland-Garros is not an unknown to the courts. That is a real, if modest, edge in the first round, and it evaporates by the third.

Qualifying is also the part of the fortnight where the clay specialist population is most visible. A tour ranking is an average across surfaces, so a player whose results are heavily concentrated on brick dust will sit lower in the list than their clay-court ability suggests. Qualifying is where those players are, and it is why the qualifying draw here contains names that never appear in the equivalent event on grass. The mechanics of how the entry list and the seeding list are built are covered in more detail in the guide to how seeds are placed in a Grand Slam draw.

Wildcards, and the politics nobody pretends are not politics

Eight places in each singles draw are given away. The organisers decide, and the decision is not appealable, not published with reasons, and not bound by ranking.

French tennis uses that allocation deliberately. A domestic federation running a major has a rational interest in putting its own players in front of its own crowd, and the FFT does so openly. Home wildcards create the early-round matches French broadcasters want, give young French players a first taste of a major, and give returning veterans a farewell in front of an audience that knows them.

There is also a reciprocal arrangement between the majors. Federations exchange wildcards, so a player who wins a designated event in one country can receive a place at a major in another. That is how a small number of places at Roland-Garros end up with Australian or American players who did not come through the French system, and how French players occasionally appear in draws on the other side of the world.

The criticisms are the obvious ones and they are not unreasonable. Eight wildcards is eight players who did not earn a place by results, in a draw where a first-round loss still pays meaningful prize money and ranking points. A player ranked just outside the cut, who spent the year grinding through smaller events, watches someone ranked far below them walk in. The tournament's answer is that a major is not purely a meritocratic ladder, that it is also a national institution with obligations to the sport in its own country, and that eight of 128 is a small tax to pay for that. Whether you accept it depends mostly on whether you think a Grand Slam belongs to the tour or to the federation that runs it.

The rules that differ, and the one that did not change

Roland-Garros plays under the same Grand Slam rules as the other three majors in almost every respect. The deciding set is settled by a ten-point tie-break at six games all, agreed jointly by the governing bodies in 2022 and applied across all four events from that year. Before then the French Open played its final set out with no tie-break at all, which is why its longest recorded matches belong to the same era of scoring as Wimbledon's.

The genuine outlier is officiating. The other three majors have moved to automated line calling and dismissed their line judges. Roland-Garros has kept human officials, and its stated reason is specific to the surface: a ball on brick dust leaves a physical mark, and an umpire can climb out of the chair, walk to the spot and inspect it. That makes the clay the only place in elite tennis where the evidence for a line call is a thing you can point at rather than a computed image, a difference explored at length in the piece on why the ball-tracking graphic is a calculation rather than a photograph.

The mark inspection is not flawless. Players dispute which mark is theirs, umpires occasionally read the wrong one, and a court that has been swept recently holds a cleaner record than one late in a five-setter. But it is evidence of a kind no other surface produces, and as long as it exists the tournament has a defensible reason to be different.

1. 1Rain begins during playBall persons and groundstaff bring the tarpaulins out onto every court in use, including the two with roofs. Covering comes first because standing water damages the top dressing faster than it stops play.
2. 2The referee assessesThe referee reads the radar and decides whether this is a passing shower that will clear or settled rain. Nothing else happens while that judgement is being made.
3. 3The roof is ordered shut on the covered courtsIf the rain has set in, the referee orders Philippe-Chatrier and Suzanne-Lenglen closed. Each takes roughly a quarter of an hour to seal.
4. 4The lights come onA closed bowl needs artificial light regardless of the hour, so the floodlights are switched on before play resumes under the roof.
5. 5The court is swept and play restartsGroundstaff lift the tarpaulins, level the dressing and re-line where needed. Matches elsewhere on the site stay suspended until the weather clears.
6. 6Conditions stay fixed for the rest of the matchOnce a match is running with the roof closed it finishes that way. The referee does not reopen mid-match, so both players get the same air, the same light and the same ball speed.

The sequence set out in the tournament's published roof guidance. The referee holds the decision at every step.

Why it is the hardest major to win from outside a narrow style band

Every major favours somebody. This one favours a type, and the type is unusually specific.

Start with what the surface subtracts. It takes away the free point from a big first serve, because a slow court gives the returner time to swing rather than block. It takes away the finishing volley, because the approach shot arrives slower and sits up. It takes away the flat winner struck from a low ball, because the ball is not low.

Then look at what it adds. It adds value to heavy topspin, which climbs after the bounce and pushes an opponent behind the baseline. It adds value to lateral movement, particularly the slide, which is a learned skill rather than a fitness attribute. It adds value to endurance across five sets in cold air over a fortnight. And it adds enormous value to the ability to construct a point over eight or ten shots without becoming impatient.

The result is a filter that runs in both directions. A player whose entire game is built around denying the opponent time will find the surface handing that time back, ball after ball. A player whose game is built around extracting errors over long exchanges will find the surface amplifying every strength they have. That is why the list of Roland-Garros champions is shorter and more concentrated than the equivalent list at any other major, and why a career can be excellent everywhere else and empty here.

There is a second-order effect that gets less attention. The clay swing that leads into Paris runs for weeks, and it is a different set of tournaments from the ones that lead into the hard-court majors. A player who commits to it arrives with match sharpness on the surface and legs conditioned for the sliding. A player who skips it and turns up on the strength of a ranking arrives with neither. The schedule filters as hard as the surface does, and the reasons the calendar has this shape are set out in the piece on how the tennis year is put together.

What the fortnight looks like day by day

The main draw runs across fifteen days, starting on a Sunday. The French Open pioneered that shape in 2006, well before the Australian Open and the US Open followed.

The first three days clear the opening round across both singles draws, spread wide so that as many courts as possible are in use. This is the best time to be at the site as a spectator and the worst time to be a scheduler, because a rain interruption on day one has to be absorbed by a programme that is already at capacity.

By the middle weekend both draws are down to the last sixteen and the programme has contracted onto the show courts. The second week is where the roofs earn their keep, because there are fewer matches to move and less slack in the schedule to move them into.

The final weekend carries the two singles finals, with the women's final traditionally on the Saturday and the men's on the Sunday. The doubles and the junior events fill the surrounding sessions, and the wheelchair draws run through the second week.

The site is small, and that constrains everything

Roland-Garros is hemmed in. It sits inside a dense western corner of Paris, bounded by roads, a ring of protected greenery and the Bois de Boulogne, and for decades the tournament could not physically grow. The other three majors sit on land that could absorb another stadium; this one could not.

The expansion that finally happened went sideways rather than outwards. Court Simonne-Mathieu, opened as part of the same modernisation programme, was built partly below ground level and wrapped in greenhouses planted with species from four continents, so that a 5,000-seat show court could be dropped into the neighbouring botanical garden without erasing it. It is the only major show court in tennis that doubles as a horticultural exhibit, and the design exists because planning permission demanded it.

The constraint runs through the fortnight in ways spectators feel. Walkways are narrow, queues for the smaller courts fill early, and the outside courts sit close enough together that a roar from one carries into the next. Players complain about it and spectators love it, which is roughly the correct trade for a major that never had room to become a business park.

What a place in the draw is actually worth

Roland-Garros publishes its prize money in euros each spring, and the total has risen steadily over the past decade. Two features of the distribution matter more than the headline number.

The first is that the two singles champions are paid identically. Equal prize money at this event dates from 2007, and the principle now applies from the first round through to the final in both draws.

The second is that the money reaches a long way down. A player beaten in the first round of the main draw still collects a sum that would take months of results at the level below to match, and losing in the final round of qualifying pays as well. For a player outside the top hundred, one good week in Paris can fund most of a season's travel, coaching and physiotherapy, which is the practical reason the qualifying event is fought so hard.

That structure is why the eight wildcards attract the scrutiny they do. Handing out a main-draw place is not only handing out a chance at glory; it is handing out a guaranteed payment large enough to change a player's year. The rest of the sport's money follows the same shape, and the mechanics of how it is generated are set out in the piece on how broadcast rights are sold and shared.

How to watch it and know what you are looking at

Four things will tell you more than the scoreline.

Watch the contact height on the backhand side. A player repeatedly taking backhands above shoulder level is being pushed into the least comfortable shot in tennis, and the point is usually already lost even if the ball comes back. A player stepping in to take the same ball on the rise is winning the exchange regardless of who eventually hits the winner.

Watch the slide out of the corner rather than the shot from it. A balanced slide that ends with the outside foot planted means the player is back in the point; a scramble that ends with them still moving means the next ball goes into open court.

Watch what happens after a rain break with the roof closed. Indoor clay is measurably quicker than the same court outdoors, because the ball stays dry and the air is warmer. Servers get more out of the surface, big hitters find their winners landing, and a match that was a grinding baseline exchange can change character within three games.

Watch the court itself as the fortnight goes on. By the second week the baselines are worn into troughs, the top dressing has migrated, and the bounce near the centre mark behaves differently from the bounce out wide. Players who have been on the surface all spring read that; players who arrived last week do not.

Watch the ball itself late in a long match. A used ball on brick dust picks up dust and moisture, fluffs up, and slows down noticeably before the change to new ones, which is why service games get harder to hold in the third and sixth games after a change and easier immediately afterwards. Commentators call it the ball getting heavy; what has actually happened is that the felt has gained drag and the surface has fed it a coating.

Roland-Garros is the major where the ground is a participant rather than a stage. Everything the tournament argues about, the roofs it has and the ones it does not, the single evening match and who gets it, the eight invitations handed out in each draw, comes back to a surface that will not be hurried and cannot be made weatherproof. Learn to read the dust and the rest of the fortnight explains itself. For the surfaces, the rankings and the scoring that sit behind every match here, the rest of our tennis coverage goes deeper, and the full set of explainers lives on the blog.