There is a belief at club level, rarely said out loud but visible in every clubhouse cupboard, that a tennis ball is a tennis ball. Buy the yellow ones, play with them until the fur goes, buy some more. Most of the confusion parents and players have about balls starts there, so it is worth taking the common beliefs one at a time.
Myth: a tennis ball is a tennis ball
Reality: the balls on the shelf are built to do three different jobs. Pressurised balls are made to play as well as possible for a limited time. Pressureless balls are made to last. Stage balls, the red, orange and green ones, are made to slow the game down so a child can actually learn to rally. Buying the wrong one for the job is why a coaching session feels flat or a club match feels sluggish.
Nothing on the outside of the tin makes this obvious, which is why people end up with a bag of pressureless balls for a league match, or a fresh tin of championship balls being fed through a ball machine.
Myth: pressureless balls are just the cheap ones
Reality: they are a different design with a different purpose. A pressurised ball has gas sealed inside the core at higher than atmospheric pressure, which is what gives it that lively, springy bounce and the crisp feel off the strings. That gas escapes slowly through the rubber from the moment the tin is opened, and with regular play the ball goes flat within weeks even though it still looks perfectly good.
A pressureless ball has no internal pressure at all. Its bounce comes from a thicker, stiffer rubber wall, so it cannot go flat. It feels heavier on the strings and a little dead by comparison, and a long session with them can be harder work on the arm. That is exactly why clubs and coaches use them by the hundred: they live in ball machines, coaching baskets and hitting-wall buckets, and they keep bouncing long after a pressurised ball would have given up.
For a match, pressurised. For repetitive practice, pressureless. Both have a place, and you will find both in the tennis ball range.
Myth: balls are finished when the fluff wears off
Reality: a bald ball is certainly finished, but a fluffy one can already be dead. Pressurised balls die from the inside out. The felt is the part you can see, and it is the least reliable guide to whether the ball still has anything left.
The honest test takes ten seconds. Drop an old ball and a brand new one from shoulder height side by side onto the same surface, and watch the difference in bounce height. If the old one is noticeably lower, it has gone, however good the felt looks. Squeezing them both between finger and thumb tells you much the same story: a dead ball gives more easily.
Playing on dead balls is not just less enjoyable. It quietly rewrites your technique, because you start swinging harder to get depth that the ball can no longer produce.
Myth: stage balls are toys
Reality: red, orange and green balls are the standard junior progression used by the LTA and ITF, and they exist for a specific reason. A full-pressure yellow ball bounces above a small child's head, which forces them to hit down and across with an arm-only swing. Slow the ball down and lower the bounce and the same child can take a proper swing at waist height.
The progression runs from red, the largest and slowest ball, played on the smallest court, through orange, then green, before a player moves to a standard yellow ball on a full court. As a rough guide, a red ball travels roughly three quarters slower than a yellow one, an orange around half, and a green around a quarter slower. Court size and racket length step up alongside the ball colour.
Those are the standard conventions rather than a fixed rulebook, and programmes vary. Check what your child's coach or club actually uses before you buy a bag of anything, because turning up with the wrong colour is a wasted session.
Myth: the quicker a child moves up the stages, the better
Reality: the ball colour is not a school year, and nobody wins anything for finishing early. A child moves up when they can rally consistently, recover to position and swing properly at the current stage, not when they turn seven.
Push a child onto a green or yellow ball too soon and you can watch the technique fall apart in a fortnight. The contact point creeps above the shoulder, the swing shortens into a chop, and the footwork stops because the ball is on them too quickly to move. Those habits take far longer to unpick than the extra term spent on orange would have cost. Coaches make this call for a living, so let them make it.
Reality: what to actually buy
A short version to take shopping:
- Club matches and league tennis: a fresh tin of pressurised balls. Open it on the day if you can.
- Ball machine, basket feeding, hitting wall: pressureless, bought in bulk. They will outlast several tins.
- Children in coaching: whichever stage colour the coach specifies, and only that.
- Practice with a partner: last week's match balls are fine until the bounce test says otherwise.
Two habits worth adopting. Do not store balls in a car boot from one month to the next, because heat and cold both shorten their life, and a racket bag with a separate compartment keeps them out of the way of your frames. And write the date on the tin lid with a marker when you open it. It settles a lot of arguments about whether the balls are still any good, and it costs nothing beyond the pen you already have in the accessories pocket.