Most tennis parents have seen it. A player who looks composed, capable, and technically sound in practice. Who hits cleanly, moves well, executes what they have been taught. And then, in a match that matters, something changes. The strokes get shorter. The decisions get slower. The player who looked ready an hour ago looks like a different person.
The instinct is to call this a mental problem. Nerves. Lack of toughness. A competitive temperament that has not developed yet. And so parents and coaches begin searching for mental performance solutions to what they understand as a mental performance problem.
The research points somewhere else.
A review of skill acquisition in tennis published in the Journal of Science and Medicine in Sport identifies a consistent finding across multiple studies: skills learned through explicit instruction, the kind produced by heavy coaching, constant correction, and prescriptive feedback, are significantly less stable under competitive stress than skills acquired through more discovery-based approaches. When a player is placed under anxiety, explicit knowledge floods back into the execution of movements that should by then be automatic. The result is what researchers call reinvestment: the player starts consciously managing a stroke they should no longer be thinking about, and the stroke deteriorates.
In practical terms, this means a player who has spent years being told exactly how to swing, where to stand, how to follow through, and what to fix has built a skill that depends on a kind of cognitive oversight. Remove the calm of practice and add the pressure of a match, and that oversight becomes interference. The player thinks their way into the error.
The player coached through discovery, one who was given problems to solve rather than mechanics to copy, builds something different. The movement pattern is less consciously accessible, which sounds like a disadvantage but is in fact the point. Skills that cannot be easily verbalised are also harder to disrupt. Under pressure, they tend to hold.
Explicit instruction has its place in development. Younger players learning new movements, or players working through significant technical changes, benefit from clear guidance. But the research suggests that as players develop, the balance should shift decisively toward environments that ask players to find their own solutions, make decisions under pressure, and learn from what happens when things do not go as planned. A practice diet of cooperative drills and corrective feedback, however well-intentioned, may be quietly building a player who performs for the coach and unravels for the scoreboard.
When your child falls apart in a match, the more useful question is how the skills they are relying on were built in the first place.