You are standing in the shop, or scrolling a listing, and the wall of cans is baffling: yellow, orange, red, “extra duty”, “championship”, “pressureless”, “high altitude”. They all look like tennis balls, and the packaging does little to explain what actually differs. Pick wrongly and the consequences are real but small: balls that go flat in a week, feel like rocks, or play far too fast for the person hitting them.
This guide sorts the categories that matter. There are really three separate questions: how the ball is built (pressurised or pressureless), what it is certified to do (the ITF’s Type 1, 2, 3 and high-altitude classes), and how fast it is meant to play (the red, orange and green stages for young players). Once you separate them, choosing is easy. If you are new to the game, the beginner’s guide to tennis covers the rest of the kit.
What every regulation ball has in common
The ITF’s Rules of Tennis set the specification for balls used in official play, and the same numbers appear in the ITF’s ball-approval documents. Whatever the type, a standard ball has a mass of 56.0 to 59.4 grams. The three standard-size types, Type 1, Type 2 and high altitude, share a diameter of 6.54 to 6.86 cm. The outside is felt, usually yellow or optic yellow, over a rubber core.
The differences between types are the rebound (how high the ball comes back when dropped from a set height), the amount it deforms under a standard load, and, for Type 3, the diameter. A reference table from Tennis Warehouse’s learning centre, summarising the ITF specification, gives these values:
| Type | Speed | Diameter | Rebound from 100 in (254 cm) drop |
|---|---|---|---|
| Type 1 | Fast | 6.54–6.86 cm | 138–151 cm |
| Type 2 | Medium | 6.54–6.86 cm | 135–147 cm |
| Type 3 | Slow | 7.0–7.3 cm | 135–147 cm |
| High altitude | Reduced bounce | 6.54–6.86 cm | 122–135 cm |
You do not need to memorise any of that. The point is that the differences are narrow. A Type 1 and a Type 2 ball differ by a few centimetres of bounce, and you would struggle to tell them apart blind.
ITF ball types: which one are you hitting?
Type 2: the medium ball (what you will almost always use)
Type 2 is the default. Reference material on the ITF specification notes that most commonly sold balls are Type 2, and in practice nearly every can you find in a shop or at a club is one. It is designed to play acceptably on every surface. If you have no particular reason to choose otherwise, buy this and move on.
Type 1: the fast ball
Type 1 is a slightly livelier ball. The ITF’s equipment documentation describes it as intended for slower surfaces such as clay, where the extra speed and bounce compensate for the surface. You will rarely see “Type 1” printed prominently, but clay-oriented balls are the usual home of it. If you mostly play on slow surfaces and want a little more pace, ask. Otherwise it is not worth the search. For how surface changes the ball’s behaviour, see tennis court surfaces explained.
Type 3: the slow, oversized ball
Type 3 is about 7.0 to 7.3 cm across, noticeably bigger than the others, which creates more air resistance and slows it down. It is the ITF’s slow category and is meant for fast courts, and the ITF’s technical documentation also lists it as permitted for play at altitude. In recreational life it is the rarest of the three. The approved lists are dominated by Type 2, and you are unlikely to find Type 3 on a normal shop shelf.
High-altitude balls
Thin air lets a normal ball fly further and bounce higher, so the ITF defines a lower-bounce ball for play at altitude: 122 to 135 cm on the standard drop test instead of 135 to 147. If you live or play high up, such as in mountain towns, these balls are made for you. If you play at sea level, as in Bangkok, Singapore or Bali, ignore them.
What “ITF approved” really means
Look for the “ITF approved” mark or the “approved by the ITF” wording on the can. It means the model has passed the ITF’s ball-approval tests (mass, size, rebound and deformation, set out in Appendix I of the Rules of Tennis). It does not mean the ball is better, only that it is eligible for official competition. For a club session or weekend rally, approval is a nice-to-have, not a requirement.
Pressurised vs pressureless: the choice that matters most to you
This is the decision that changes how your balls behave day to day.
Pressurised balls
A pressurised ball has a hollow rubber core filled with compressed gas. That is where its lively, consistent bounce comes from, and why it feels “soft” and responsive on the strings. It is the standard ball for competition and the kind sold in the pressurised can that hisses when opened.
The trade-off is that the gas slowly escapes. Opened balls start losing bounce straight away, and balls left in a bag in a hot car lose it faster. Even unplayed balls go flat if you leave the can open. There is no honest single number for how long a ball lasts, because it depends on how often you play, the surface and the temperature, but most players notice a drop-off within a handful of sessions.
Rough abrasive hard courts also wear felt, so a ball can feel dead through felt wear while still holding pressure. Both effects stack up.
Pressureless balls
A pressureless ball has a solid rubber core, so there is nothing to leak. It holds its bounce far longer, which is why it is popular with ball machines, coaches running lots of drills, and casual players who only hit once or twice a week.
The trade-off is feel. Pressureless balls generally feel harder and heavier off the strings, and some players find they transmit more shock to the arm, especially if you already have elbow or shoulder trouble. They also wear down in the felt before the core goes, so they still do not last forever. They can bounce differently from a fresh pressurised ball, so if you play matches with pressurised balls, it makes sense to practise with them too.
Which should you buy?
| Situation | Better choice |
|---|---|
| Playing a match or social game once or twice a week | Pressurised Type 2 |
| Ball machine or coaching basket, lots of repetition | Pressureless |
| Hitting against a wall or practising alone | Pressureless (see below) |
| Bad elbow or shoulder | Pressurised, and consider a softer, slower ball |
| Hot climate, balls stored in a bag or car | Pressureless lasts better, or keep pressurised balls in the can and out of heat |
The ITF also notes that pressureless balls are an option at altitude when properly acclimatised to it, which is another way of saying they are a durable, flexible choice, not just a budget one.
The red, orange and green stages
If you have ever seen kids playing with soft, brightly coloured balls on a shorter court, you have seen the ITF’s Play+Stay stages. They exist to let young players rally and learn technique properly, rather than hitting a ball that bounces over their heads.
The ITF’s Play+Stay page lists three stages. Speeds are estimates relative to a standard yellow ball:
| Stage | Colour | Estimated speed | Court | Net height (centre) |
|---|---|---|---|---|
| 3 | Red | 75% slower | 10.97–12.8 m by 4.88–6.1 m | 0.8–0.838 m |
| 2 | Orange | 50% slower | 17.98–18.29 m by 6.4–8.3 m | 0.8–0.914 m |
| 1 | Green | 25% slower | Full court, 23.77 m by 8.23 m | 0.914 m |
Red balls come in foam (8 to 9 cm) and felt (7 to 8 cm) versions, orange balls are 6 to 6.86 cm and green balls are 6.3 to 6.86 cm. The ITF applies this to its programme for players aged 10 and under, and competition for that age group is meant to be played with these slower balls. The ITF does not assign a fixed age to each colour on that page, and different organisers and coaches assign slightly different age bands, so follow whoever is teaching.
Should adults use them?
Not as a default, but it is not silly either. If you are an adult beginner who cannot keep a rally going, a green ball on a full court (it is the same court as the yellow ball) slows the game just enough to get more repetitions. Many coaches will happily do it for a first few sessions, and it costs you nothing but pride. It is also a good way to play with a child, since the ball speed matches what they can handle.
Using balls that are not new
Fresh balls are great for a match. They are a waste for most practice. A common, sensible split among club players is to use new or near-new balls for matches and keep the older ones for drills, serve baskets and wall practice. If you are building a routine for solo work, the beginner drills article has exercises that suit older balls well.
How to tell a ball is finished
- The bounce test. Drop a worn ball next to a fresh one from shoulder height. If the worn ball comes back clearly lower, the pressure or the felt is gone.
- The feel. A dead ball feels heavy and “clunky” off the strings. You find yourself swinging harder to get the same depth.
- The felt. If the felt is bald in patches, the ball flies faster and less predictably.
Storing balls
Keep pressurised balls in a sealed can or ball saver between sessions, and out of direct sun or a parked car. Resealing does not restore pressure, but it slows the loss. Store pressureless balls anywhere dry, since they are not pressure-dependent.
Choosing balls by where you play
Surface and climate matter more than brand. On clay, balls pick up dust and get heavier through the session. On abrasive hard courts, felt wears faster. In humid, hot places like Southeast Asia, balls feel heavier and slower in the damp air and degrade quicker in a hot bag. For more on how courts differ, see tennis court surfaces.
If you play in Bangkok, the Bangkok court directory lists clubs and their surfaces. Most clubs and coaches supply balls for lessons, so you can see what they use before buying your own. Prices vary by brand, can size and shop, and a fixed figure would be out of date, so check current rates where you buy.
Balls and finding a game
If you are buying balls, you probably want somewhere to use them. Open Play is Breakers’ level-matched, drop-in social tennis: you book a seat in a session for your level and play with people at your level, no partner needed. It runs in Bangkok for now, and the balls and court booking are part of the session’s own arrangements, so check the details when you book. You can see upcoming Open Play sessions in the app.
Elsewhere in the world, use the global club directory to find courts, and bring a fresh can for your match.
Quick recommendations
- Most adults, most of the time: pressurised Type 2 balls, bought as a can for matches.
- Practice and drills: older balls, or pressureless balls for machines and baskets.
- Wall or solo hitting: pressureless balls you do not mind losing.
- Beginner who needs more time: try a green ball for a few sessions.
- Playing high in the mountains: high-altitude balls.
- Children under 10: red, orange or green, depending on the stage your coach or club uses.
Sources
- ITF, “ITF Tennis Play and Stay”: https://www.itftennis.com/en/growing-the-game/itf-tennis-play-and-stay
- ITF, “2026 ITF ball approval procedures”: https://www.itftennis.com/media/14859/2026-itf-ball-approval-procedures.pdf
- ITF, “2023 technical booklet”: https://www.itftennis.com/media/4420/2023-technical-booklet.pdf
- Tennis Warehouse University, ball testing article (summary of the ITF specification table): https://twu.tennis-warehouse.com/learning_center/ballexperiment.php
Frequently asked questions
What are the different types of tennis balls?
By construction, pressurised balls (hollow rubber core filled with compressed gas) and pressureless balls (a solid core). By ITF classification, Type 1 (fast), Type 2 (medium), Type 3 (slow) and high altitude. For children, the ITF also uses slower stage balls: red, orange and green. Most adult club tennis is played with Type 2 pressurised balls.
What is the difference between pressurised and pressureless tennis balls?
Pressurised balls have a hollow core filled with compressed gas, which gives a lively bounce but fades once the can is opened and the gas escapes. Pressureless balls have a solid rubber core, so they keep their bounce for much longer, but they tend to feel harder and heavier off the strings and wear out through the felt rather than through lost pressure.
What are the red, orange and green tennis balls?
They are slower, lower-bouncing balls the ITF uses in its Play+Stay programme for young players. The ITF describes red as about 75% slower than a standard yellow ball, orange about 50% slower and green about 25% slower, each paired with a smaller court and a lower net. They are estimates, not exact speeds.
Which tennis ball is best for beginners?
For adult beginners, a standard Type 2 ball is the normal choice and what you will meet at nearly every club. If you struggle to keep rallies going, a slower stage ball (green, or orange on a smaller court) is a legitimate way to learn the strokes, and some coaches use them with adults for exactly that.
Do tennis balls expire?
Unopened pressurised balls keep for a while, but once the can is opened they start losing pressure and bounce, and felt wears with every session. There is no fixed number of hours that applies to every ball. A practical test is to bounce one next to a fresh ball: if it is clearly lower and feels dead off the racket, replace it.
