The gem is not on the video – lessons from digging for data in Vietnam's youth table tennis

On a Saturday afternoon, I sat in the far corner of a table tennis hall in Hai Phong. At table number six, a boy of about 14 had just lost a practice set 7-11. The coach stood at the end of the table, shook his head, and turned to adjust the racket of another student. The boy said nothing. He bent down, picked up the ball under the table, rolled it in his palm for two seconds, then walked back to the serving position. I wrote in my notebook: 'Picks up the ball after losing, without anyone telling him to.' My pen stopped. No analytics software could capture that moment. No television replay could record how the boy stood still looking at the ball rolling under the table. Because it was not recorded, it would never appear in any scouting report. In 36 years of watching youth table tennis, I learned that the gem is not in the beautiful rallies the camera catches; the gem is in how a child stands after losing a point. A backhand loop can be taught in three months. But the habit of picking up the ball after a lost set, of analyzing your own mistakes without being told, cannot be taught. It can only be nurtured. And scouts like me rarely have the patience to sit through a practice with no score, no spectators. I could tell you about a golden generation that put Vietnamese table tennis on the SEA Games map. Dinh Quang Linh won the men's singles title; Mai Hoang My Trang repeatedly reached the medals. Those victories were real. But if you look deeper, that success came mainly from a generation of exceptional individuals, not from a well-run youth development system. When that generation passes, there is a gap. I have visited many table tennis centres from Hanoi, Hai Phong, Da Nang to Ho Chi Minh City. The common pattern is a roof, dozens of tables, a few experienced coaches, but no performance analysis department. No movement-tracking data, no error-rate statistics in long rallies, no monitoring system for players aged 10-16. Coaches teach by eye and correct by instinct. Their instinct is precious, but it cannot be passed on, cannot be verified, and cannot produce a long-term development map. When I talk to young coaches, I often ask one question: which player in your group can correct his own mistakes best? Most answer by naming the hardest-working kids. But when I ask how they know, the answer is usually 'feeling' or 'you just see it when he practises.' That feeling is not wrong, but it is never quantified. A table tennis nation that wants to compete with Japan, South Korea or China needs to turn feeling into verifiable data. I propose a three-layer observation framework for youth training centres. The first layer is technique: the quality of the loop when the ball comes to different positions, the stability of footwork, the ability to return to balance after each shot. The second layer is decision-making: in a rally, the player chooses to loop or push, to drop short or push long, and most importantly, the repetition of that choice in similar situations. The third layer is behaviour: how the player faces an unfavourable score, the time between balls, self-talk habits, and attitude when the coach turns away. These three layers do not require expensive equipment. They require a notebook, a pen, and a person patient enough to sit through a session without being carried away by the sound of the ball. But in an age when everyone trusts screens, watching a boy repeat a wrist flick for 30 minutes is considered a waste. I disagree. I believe that in those boring repetitions, the true character of a player is most clearly revealed. In 2026, I was asked to build a player evaluation model for a club. I designed a 'tactical vision index', counting 45 passing parameters across 20 matches. Three Southeast Asian clubs asked to buy the rights to the model. But when I tested it out on the field, I realised the data was only accurate at a collective level, and very misleading at an individual level. A player can have a high passing accuracy but always choose the safe option. Another player may have lower accuracy but is the only one who sees the gap before it opens. If I only looked at the numbers, I would have cut the wrong players. Since then I have had one principle: data is a map, not a journey. A map only shows me which roads are worth taking, but it cannot tell me how it feels to walk on them. For youth table tennis, this is even more true. A 13-year-old can have impressive service numbers in the practice hall, but stepping into an unfamiliar arena with noise, lighting and the pressure of a knockout match is completely different. Practice-hall numbers measure skill; they don't measure courage. I apply that principle to table tennis scouting. For every young prospect, I take three sessions. First, I watch them play a match. Second, I watch them practise. Third, I watch them in a match they lose — a match where they fall behind and have to chase. This three-session rule helps me avoid rushing to conclusions from one flash of brilliance. It helps me notice children who can rise after failure, a quality no ranking table can measure. In 2026, when stadiums were empty because of the pandemic, I had a rare chance to see Vietnamese youth table tennis in one condition: no crowds, no tournaments, no spotlight. For me, that was not a year of loss. It was a year when the truth came out. When no one cheers, when there is no trophy to aim for, the players who keep training every day are the rare ones with inner motivation. Those who only practised when people were watching faded. The empty court did not create a crisis; it exposed what we had hidden behind noise. I remember a 16-year-old trainee who came to the hall every morning half an hour early, just to repeat a two-corner footwork drill alone. During six months with no tournaments, he did not miss a session. He was not outstanding in any youth event, but when tournaments returned, he was the only one who did not run out of air in the fifth set. His story made me realise something uncomfortable: our scouting system focuses too much on tournament results and forgets the process. A 14-year-old who wins a youth championship is chased, praised, labelled a 'prodigy'. But a boy who arrives earlier than everyone else, who quietly trains basic drills in front of no one, is absent from every list. I do not have a perfect large sample to confirm this, but observing youth training centres in the region, I see a worrying ratio: seven out of ten players who won national titles before the age of 15 failed to keep their top form at 18-20. Conversely, most players with sustainable careers at 23-25 were not highly rated at a younger age. Those numbers are enough to make me ask: are we investing in the wrong places? This goes against the instinct of the media. The media need short, shiny stories: a wonder kid, a tournament upset, a record transfer. But player development is a long, boring, repetitive story. When I write about a boy with 'nothing special', people ask why I waste my time. My answer: because ordinary-looking children are where miracles often live. If everyone can see that, it is no longer a discovery. I also want to talk about burnout. Many centres make young players train too hard technically, too fast tactically, forgetting that the body and mind of a 13-year-old cannot handle the intensity of a 20-year-old athlete. I have seen many young talents with a very strong loop at 14, but at 17 they begin to have shoulder and wrist pain, and they disappear from the table tennis map. A strong loop at a young age often comes from overusing force instead of using the centre of gravity. If it is not corrected in time, it becomes a time bomb. Almost no centre systematically tracks the injury trajectory of young players. I have a story I rarely tell. In 2026, while the transfer market was in chaos because of the pandemic, I almost completed a deal to send a 19-year-old player to Thailand for 2 million USD. He had speed, skill, and crucially, a trait that made me trust him: after every lost ball, he was the first to track back. Nobody taught him that. But I hesitated and missed the deadline. He stayed and slowly faded because he did not have a suitable environment to develop. That missed transfer taught me more than all my successful deals combined: opportunity never comes when you are fully ready. It comes when you have prepared everything except the confidence to seize it. This story is not about one transfer. It is about how we are late in spotting and nurturing talent. A 19-year-old cannot wait for a perfect system. He needs to be discovered at the right moment. If our scouting system only looks at numbers and videos, we will miss the most important signals — the signals that lie in how a person stands up after falling. So where does the solution for Vietnamese youth table tennis lie? I do not have enough information to give a definitive formula, but I can propose a starting point: begin to record the invisible. Each centre can use a small notebook; each coach writes three notes after every session: one positive behaviour, one negative behaviour, and one unusual change from the day before. After a year, the centre will have a set of data no software can buy. That data is not on a screen; it lives in the observation habits of the coach, and it can be passed on to the next generation. I also believe that centres need to build a long-term development path for each player, based on the physical growth rhythm of each individual. Some children mature early, some mature late. If we treat them all by the same standard at 15, we will discard those who come later. A system that does not observe, does not record, and lacks patience will only produce players who look good in the practice hall and disappear in real matches. Finally, I want to speak about my own limits. At 52, I still believe that a player can be read in three minutes of his decision-making without the ball. But I also realise that my eyes can miss what a motion sensor might catch. Modern table tennis does not allow us to choose one side: we need both eyes and data, both intuition and measurement. Data is a young assistant — talkative, sometimes annoying, but occasionally it points to the exact corner that my old eyes forgot. What happened to the boy who picked up the ball under the table? I am not sure. I did not follow him to the end; that is my mistake. But he taught me a lesson: a player's value is not in titles, rankings, or contract prices. It lies in the small invisible habits he repeats every day when no one is watching. If we find those habits before they become success, we will see the future. If we only look at trophies, we will always arrive late and pick up what others have discarded. As I write these lines, the sun has disappeared behind the practice hall. I close my notebook, put away my pen, and ask myself: how many gems are silently rolling under the tables of table tennis centres across the country, waiting for someone patient enough to bend down and pick them up? I do not know. But I will keep bending down, keep watching, keep writing. People call me a gold digger, but I am only a patient man listening to the ground. And the ground in Vietnam still has a great deal to say.