One of the most common questions I get from tennis parents is……
“When should my child move up to the next ball colour?”
Should they move from red to orange because they are winning lots of matches? Should they move to green because their technique looks good? Should a talented nine-year-old already be playing with a yellow ball? And if their friends have moved up before them, are they somehow being left behind?
For the first 20 years of my coaching career, I probably thought about progression in much the same way.
Red came first. Then orange. Then green. Eventually you reached yellow.
The better the player was, the quicker I thought they should move through those stages.
I no longer see it that way.
In fact, I think one of the biggest problems with the whole conversation is hidden inside the phrase “move up.”
It immediately suggests hierarchy. Orange is better than red. Green is better than orange. Yellow is where the proper tennis eventually begins.
But what if ball colours are not levels at all?
What if they are simply tools?
Why do we use different tennis ball colours?
The original idea behind red, orange and green tennis is relatively straightforward. Children are smaller than adults, have different physical capacities and need more time and appropriately sized spaces if they are going to experience something resembling the actual game.
The ITF’s Tennis10s system therefore scales both the ball and court. Red balls are approximately 75% slower than yellow, orange around 50% slower and green around 25% slower. Red and orange also use smaller courts, whereas green uses the full-sized court.
In Britain, competition is also organised around age groups. The current LTA structure uses 8U red, 9U orange and 10U green competition, with yellow-ball competition thereafter. The detailed eligibility rules are based on year of birth.
That structure is understandable. Federations need competition systems, and competition systems need rules.
But there is an important distinction between a competition regulation and a theory of child development.
Children do not develop neatly according to the calendar.
The problem I kept seeing from orange to green
For years, one transition particularly frustrated me.
I would have a really capable orange-ball player. Their tennis looked excellent. They moved well, served reasonably well, rallied confidently and appeared technically sound.
Then I moved them onto green.
Suddenly it sometimes looked as though they had never played tennis before.
The serve disappeared. Rally lengths collapsed. Their movement changed. The forehand technique I thought we had “built” no longer looked the same. Instead of being proactive, they often looked rushed and defensive.
I couldn’t understand it.
At the time, I believed skill was largely something stored inside the player. We built the fundamentals at red, added complexity at orange, added another layer at green and eventually transferred everything onto the yellow-ball court.
If the skill had been learned, why did so much of it appear to disappear when I changed the environment?
That question eventually became much more interesting to me than trying to fix their forehands again.
Perhaps the skill had not disappeared.
Perhaps I had changed the problem.
Moving ball colour changes much more than the ball
When we move a child from orange to green, we are not simply giving them a slightly quicker tennis ball.
We change the ball speed.
We change the bounce.
We change the space they have to cover.
We alter the time available to perceive what is happening and organise an action.
We change their relationship with the net.
We change the distances involved in serving and returning.
And all of those things interact with the child’s height, strength, speed, experience and physical development.
From an ecological-dynamics perspective, that matters because skill does not exist independently of the environment in which it is expressed. The player’s behaviour emerges through the relationship between the individual, the task and the environment.
Change the environment and you should expect behaviour to change.
This is why I now pay much more attention to physical maturation and player–environment fit, rather than chronological age alone.
Two eight-year-olds can be completely different.
One may be considerably taller and stronger. One may have played 80 competitive matches while the other has played five. One may be naturally quick while another is still developing their physical capacities.
Giving them the same ball simply because they share a birth year does not make their developmental needs identical.
I now look at behaviour, not just age or results
Within our programme, one of our main intentions is very simple….
Can the player put the ball somewhere that makes it difficult for the opponent to return?
We want players who create rather than wait.
That means I am interested in behaviours such as changing direction, stretching an opponent, jamming them, moving forwards when opportunities appear and using the serve and return to influence the point.
When I change the environment, I watch what happens to those behaviours.
If a player who was previously proactive suddenly becomes passive, starts looping everything through the middle, stops moving forwards and begins simply trying to survive, I become interested in why.
The immediate conclusion does not have to be, “They need better technique.”
The environment might currently be asking too much.
That does not mean the child should never play there. It might simply mean we need to scale something differently while they adapt.
The net matters more than many coaches realise
This is an area where the research is particularly interesting.
One study involving 16 boys around 10 years old manipulated both court dimensions and net height. With a scaled net, the children produced more winners, more forced errors, more volleys, contacted more balls at comfortable heights and played from more forward court positions. The researchers concluded that scaling the net appeared to encourage a more attacking style of play.
Another study specifically manipulated net height with skilled players aged 10 and under. Lowering the net increased winners, produced more shots from inside the baseline and improved first-serve success. Importantly, though, the lowest net also shortened rallies substantially, showing that scaling is not simply a case of “lower is always better.”
A further study with under-10 players compared normal green competition with a modified version using a smaller court and lower net. The modified environment produced greater service effectiveness and greater technical-tactical variability.
This is remarkably close to what we have observed within our own programme.
Lower the net or modify the court and we often see players become more proactive. Return to the standard green environment and sometimes the behaviours change again.
I would not claim that this happens because a higher net simply causes children to “see less information.” That mechanism requires much more evidence.
What we can say is that changing the dimensions of the environment changes the opportunities available to the player, and tennis research has demonstrated measurable changes in the behaviours that emerge.
Ball colours are tools, not levels
This is perhaps the biggest change we have made in our programme.
Our players use different balls and court dimensions regularly.
Yellow-ball academy players might use orange balls.
Orange players might play on smaller or wider courts.
Red players might experience several different versions of a red court within the same term.
We change court length. We change width. We change net height. We change balls.
Why?
Because each manipulation changes the problem.
If I want a yellow-ball player to experience more opportunities to attack short balls, a smaller space may be useful.
If I want to alter time available, I can change the ball.
If I want players to explore different angles, I can alter court geometry.
None of this means the player has been “demoted.”
They are experiencing a different challenge.
That distinction becomes much easier once players stop associating ball colour with status.
Instead of saying, “You’re going back to orange today,” we might simply say “Here’s today’s challenge.”
Can you adapt to this?”
Language matters.
Should players ever move backwards?
Absolutely.
Although I wouldn’t describe it as moving backwards.
If a green-ball player uses an orange ball, they have not suddenly become an orange-ball player.
They are using a different piece of equipment.
Research supports the idea that modified equipment changes the opportunities children experience.
Buszard and colleagues tested children using different racket sizes and ball compressions. The combination of the smallest racket and lowest-compression ball produced the best forehand performance, while the lower-compression ball also encouraged more favourable contact characteristics, including low-to-high racket movement and contact in front and to the side of the body.
Another study of elite 10-year-olds found that a lower-compression ball resulted in more comfortable groundstroke contact heights and more balls being played at the net.
That does not prove that slower balls universally create better players.
It does show something important, equipment changes behaviour.
That means we should choose equipment according to the behaviour and learning opportunities we want to create, rather than according to status.
Moving from one colour to another should be a transition, not an event
One of the strangest things about age-based competition systems is that the environment can change much faster than the child does.
A player can finish December eligible for one age group and begin January eligible for another.
Biologically, nothing magical happened at midnight.
They are still essentially the same child.
Yet their competitive environment can suddenly involve a different ball, different court and different opponents.
This is why we use transition environments.
We might have a player doing some red and some orange.
We might use what we call a Red Plus court, somewhere between traditional red and orange dimensions.
Moving towards green, we might use a shorter court, lower net or occasionally combine an orange ball with a larger court.
The same principle can continue towards yellow.
Rather than Red → Orange → Green → Yellow
I prefer something much more fluid.
The environments overlap.
The player gradually explores the next set of demands while still spending time in an environment where they can play effective tennis.
Competition experience matters too
Another thing I now consider much more carefully is match experience.
Suppose I have two players of similar age and ability.
One has played 60 red-ball matches.
The other has played six.
Why would I automatically rush both into orange at the same time?
The second player may still have an enormous amount to learn about competition at red, scoring, winning, losing, managing different opponents, recognising opportunities, serving under pressure and adapting when things do not go to plan.
Moving to a bigger court does not magically provide more useful learning.
Sometimes the best developmental decision is simply to give the player more experience solving the problems available in their current environment.
Interestingly, the LTA’s own current participation scheme recognises match volume, with rewards attached to accumulating competition experiences within each red, orange and green stage.
For me, experience matters far more than racing through colours.
“My child is winning everything. Should they move up?”
Not necessarily.
This is another assumption I have changed my mind about.
Winning lots of matches tells us something about current performance. It does not automatically tell us why the child is winning or whether the next ball colour is developmentally appropriate.
Junior tennis contains enormous variation in physical maturity.
A child might dominate because they are currently taller, quicker and stronger than most of their peers. That advantage can disappear when other children physically catch up.
Results therefore need context.
I am also wary of environments where talented young players almost never experience setbacks. Competition should contain problems to solve.
But the only way to increase challenge is not necessarily to move them onto a faster ball.
Within our own environment we can manipulate scoring, starting positions, court dimensions, opponents or individual constraints while retaining the ball and court that still produce desirable tennis.
There is a crucial distinction here, more challenge is not automatically better challenge.
What happens when children “play up” too early?
This is where the research becomes particularly valuable.
Moving onto a bigger court, faster ball or full-height net changes the way children play.
It does not simply make their existing tennis harder.
For example, studies of scaled courts and nets have found more aggressive court positioning, increased volleying, more winners and more comfortable contact heights under appropriately modified conditions.
Research comparing modified green competition with the standard green environment similarly found changes in serving effectiveness, shot distribution and technical-tactical variability.
Fitzpatrick and colleagues have also shown that the different Mini Tennis stages shape children’s match-play behaviours, reinforcing the point that red, orange, green and full-ball tennis are not simply identical games played at increasing difficulty.
The player adapts to whichever environment we give them.
That adaptation may be useful.
But sometimes the child adapts by becoming more defensive, using higher trajectories, staying further back or reducing the range of attacking behaviours available to them.
If our objective is to create a proactive player, we should at least question whether that is the adaptation we want.
Playing yellow at nine does not prove future potential
This is another area where coaches and parents need to be careful.
A nine-year-old who can cope with a yellow ball and full court may look extraordinary.
But “can cope with it” and “this is the best environment for development” are different claims.
We also need to remember the hidden influence of physical maturation.
A nine-year-old may effectively have the physical dimensions and action capabilities of an older child. Their ability to perform on the larger court may therefore say as much about their current body as their long-term tennis potential.
We are particularly vulnerable to survivorship bias here.
We remember the exceptional player who played full-court yellow-ball tennis very young and later became successful.
We rarely hear about all the players who followed the same pathway and did not.
Early success is not proof that the pathway caused later success.
Can you keep a player on a smaller court for too long?
Of course an environment can eventually become insufficiently challenging.
The answer is not to leave every child at red forever.
The point is that the decision should emerge from how the player interacts with the environment, rather than because someone has decided that bigger must be better.
As players develop physically and accumulate experience, their existing environment may no longer create enough of the problems they need to solve.
That is when we can increase the challenge.
Perhaps we lengthen the court.
Perhaps we increase the ball speed.
Perhaps we raise the net.
Perhaps we introduce the next environment for part of the week.
Then we watch.
What happens to the player?
Can they still serve with intent?
Can they attack space?
Can they change direction?
Can they move forwards?
Can they defend and survive when necessary?
Can they still create rather than simply wait?
Those behaviours tell me considerably more than their birthday.
What about racket size?
Rackets belong in the same conversation.
A larger racket is not automatically an upgrade either.
There is good evidence that appropriately scaled rackets can benefit children. The earlier Buszard study showed improved forehand performance with smaller rackets combined with low-compression balls.
More recent biomechanics research compared 23-, 25- and 27-inch rackets in competitive players aged eight to 11. Interestingly, the study did not find significant differences in ball speed, maximal racket-head velocity or serve percentage between the rackets. However, the smallest racket produced lower shoulder and elbow loading while maintaining serve performance.
I think that is an important finding because it stops us making an unnecessarily simplistic claim.
Smaller rackets are not beneficial because they magically make everyone swing faster.
They may simply fit the child’s current action capabilities better.
Again, it comes back to fit.
So when should my child move from red to orange, orange to green or green to yellow?
There is no mythical number.
There is no ranking that suddenly means a child is ready.
Winning ten tournaments does not automatically mean they should move.
Neither does reaching a certain birthday suddenly transform their capabilities.
Competition systems need age boundaries, but coaches and parents should not confuse those administrative boundaries with universal developmental milestones.
I would look at the whole child.
Their physical maturation matters.
Their body size matters.
Their experience matters.
Their competition history matters.
Their action capabilities matter.
Most importantly, I would watch what happens when they play.
Does the environment allow them to play tennis rather than merely survive it?
Can they recognise and create opportunities?
Can they use their serve and return purposefully?
Can they attack, defend, stretch and jam?
Can they adapt?
If the answers remain broadly yes as we gradually increase the demands, the transition may be appropriate.
If those behaviours disappear completely, I would not automatically blame the player.
I would question the environment.
Ball colours are tools, not levels
This is ultimately what I want parents and coaches to take from this article.
Red is not inferior to orange.
Orange is not inferior to green.
Green is not simply a waiting room before “real tennis” begins.
They are different tools that allow us to manipulate time, space, bounce and movement demands.
Children’s development is messy.
It is nonlinear.
Two players born on exactly the same day can require completely different environments.
Once we accept that, we can stop racing children through a pathway simply because moving up looks like progress.
We can take some of our own adult ego out of junior tennis.
We can stop using rankings and results at eight, nine or ten as evidence that development is either ahead or behind schedule.
And we can begin asking a much more useful question.
Not “When can my child move up?”
But “Which ball, court and environment currently gives my child the best opportunities to develop the tennis behaviours they need?”
That answer will change as the child changes.
And that is exactly the point.
References
Buszard, T., Farrow, D., Reid, M., & Masters, R. S. W. (2014). Modifying equipment in early skill development: A tennis perspective. Research Quarterly for Exercise and Sport, 85(2), 218–225. DOI: 10.1080/02701367.2014.893054.
Kachel, K., Buszard, T., & Reid, M. (2015). The effect of ball compression on the match-play characteristics of elite junior tennis players. Journal of Sports Sciences. DOI: 10.1080/02640414.2014.942683.
Timmerman, E. A., De Water, J., Kachel, K., Reid, M., Farrow, D., & Savelsbergh, G. J. P. (2015). The effect of equipment scaling on children’s sport performance: The case for tennis. Journal of Sports Sciences, 33, 1093–1100. DOI: 10.1080/02640414.2014.986498.
Limpens, V., Buszard, T., Shoemaker, E., Savelsbergh, G. J. P., & Reid, M. (2018). Scaling constraints in junior tennis: The influence of net height on skilled players’ match-play performance. Research Quarterly for Exercise and Sport, 89. DOI: 10.1080/02701367.2017.1413230.
Sánchez-Pay, A., Ortega-Soto, J. A., Courel-Ibáñez, J., & colleagues. (2019). Effect of modification rules in competition on technical–tactical action in young tennis players (Under-10). Frontiers in Psychology, 10, 2789.
Fitzpatrick, A., Davids, K., & Stone, J. A. (2017). Effects of Lawn Tennis Association mini tennis as task constraints on children’s match-play characteristics. Journal of Sports Sciences, 35(22), 2204–2210. DOI: 10.1080/02640414.2016.1261179.
