The Notebook and the Data Void of Vietnamese Youth Table Tennis

Late March, the multi-purpose arena of a province in the northern delta was hot as an oven. I sat in stand B, a worn-spined notebook in hand, recording every service rhythm of a fifteen-year-old boy from an outer district. Beside me, a middle-aged man in a provincial team jacket was also writing. By hand, line by line, with a blue ballpoint pen half drained of ink.

I asked to see it. He handed me the notebook. Forty-two pages. Inside was a list of eighteen athletes, recorded as: name, year of birth, dominant hand, blade type, a few bullet points on strengths. No match dates. No game scores. No count of points won on service. No updated height, not a single line on injury history.

That was the entire record of the youth table tennis cohort of a province with more than twenty years of tradition. Forty-two pages of squared paper. I closed the notebook, gave it back, and a strange image formed in my head: a modern sports analytics pipeline running its input, and at the mouth of it, an empty file.

To understand why forty-two pages of squared paper can be the entire dataset of a generation, you have to look at how Vietnamese youth table tennis actually operates. Each year the national youth tournament system holds one cycle, divided into several age groups from children to adolescents and juniors. Regional tournaments and provincial open events are scattered through the year. Training is mainly delivered by provincial and municipal training centres, a few ministry-affiliated units, and a handful of private clubs.

At most of these units, one coach holds several roles at once: technical teacher, student manager, caterer, parent liaison, results reporter, and record keeper. In ten years of visiting grassroots venues, I have never met a provincial youth table tennis centre with a dedicated data analysis position. Nor have I met a department at local federation level that archives youth tournament results in a way that can be retrieved years later.

Table tennis's position in the wider sports statistics picture is worth noting. Vietnamese football already has player-tracking systems at a few large academies. Basketball has platforms recording statistics from high-school level. Table tennis is different. Once an athlete steps onto the international stage, data about them begins to appear: athlete profiles on the International Table Tennis Federation system, ranking points, head-to-head results in professional tour events. But that is data about someone who has already passed through ten to fifteen years of training.

The whole road before that — the road that determines whether a child becomes an athlete at all — sits outside every archiving system.

I once asked three local federations whether they could provide youth tournament results from the past ten years. One said the old records were lost after a headquarters move. One sent me a medal list, names only, no scores. The third was blunt: only finals were kept, earlier rounds went unrecorded.

That is the state of the input. And when the input is empty, every analysis downstream becomes a memory game.

A decent youth table tennis player record needs three tiers of data, and in Vietnam all three are empty.

The first tier is identity: full name, year of birth, dominant hand, height, weight, blade type, rubber type, when training began. The second is competition: result of every match, score of every game, opponent, playing conditions, point-by-point statistics. The third is development: periodic physical testing, monthly technical notes, injury history, equipment-change history.

In the notebook I held in Hai Duong, the first tier was about half filled. The second tier was entirely blank. The third did not exist. And I must be clear: this is not the isolated case of one lazy province. It is the general state I encountered at almost every youth training point I have ever set foot in over ten years.

In table tennis, a match is shaped by the service and the third ball. Almost every coach says this to their students, from big-city centres to a practice hall in a coastal district. But almost nobody records it as data.

A minimum dataset for a young player, done seriously, needs about twelve cells. Percentage of points won on service, split by spin type: topspin, backspin, sidespin, no spin. Percentage of points won on service, split by placement: short, half-long, long. Percentage of points won on the third ball, split by response: counter-loop, power loop, flat hit, push. Average rally length per point. Error rate on the backhand when forced into the backhand corner. Win rate at deuce from nine-all onwards. Win rate when trailing within a game. Height and weight updated quarterly. Date of rubber change. Date of blade change. Injury type and time out. Training sessions per week.

Not one of these cells is systematically recorded at any youth tournament I have attended in ten years. Not once. I have personally recorded them for hundreds of athletes, but that is a journalist's notebook, not a system. When I leave the arena, my notebook leaves with me.

The consequence is not a shortage of pretty reports. The consequence is that selection decisions get pushed toward impression. A coach evaluates a fifteen-year-old from the feeling of the most recent match he watched. A scout decides in one afternoon. A place in a national youth squad can hinge on whether a kid turned up at the right tournament, met the right opponent, slept well the night before.

I once witnessed a case that haunted me for years. A fourteen-year-old girl won four straight qualifying matches with a patient defensive style, the kind most of the stands found boring. She lost in the semi-final to a clearly stronger opponent, three games to nil, but in all three games she dragged the score to nine. Nobody recorded that. Nobody recorded that she had won six of eight deciding points across her four earlier matches. After the tournament she was not picked for the training squad. The reason given to me was: defensive player, no future.

Six months later, that same girl won a regional title. Nobody at the federation remembered the earlier assessment, because the earlier assessment had never been written down.

That is the concrete cost of an empty data pipeline.

There is another variable I consider among the most important, and it is almost entirely ignored: equipment.

In table tennis, equipment is part of technique, not an accessory. A power loop struck with hard rubber differs in feel, trajectory and success rate from the same motion on soft rubber. When a young player switches from soft rubber to something harder, or from an all-wood blade to one with a carbon layer, the adaptation period usually runs two to four weeks. During that window, results drop in a predictable way.

Without an equipment log, that drop gets called something else: plateau, no progress, mental problems.

Between thirteen and seventeen, the body changes at a pace that makes every forecast fragile. A kid who grows eight centimetres in a year often temporarily loses coordination, reacts more slowly for a few months, loses the feel of the ball. Without periodic height measurement, that phase gets called a slump and can cost a child their place on a list. I have seen this happen at least three times.

Psychology sits in the same condition. The ability to handle pressure at a deciding point is observable, recordable, countable. But the most common way of recording it in Vietnam remains one line in a notebook: weak mentality. Three words. No context, no sample, no date, no opponent. A judgement like that can follow a child for an entire career.

In 2026, at seventeen and still a schoolboy in Saigon, I started a personal blog called Những mầm non — The Seedlings. Over eight months I visited the PVF youth football academy to watch twelve under-17 matches, recorded every detail of thirty-eight players, and scored them out of ten. My first post, about a seventeen-year-old midfielder, drew more than three thousand two hundred reads.

Curiosity about people the press had not noticed laid the foundation for what I later called sports archaeology. But when I moved to table tennis, I realised a fundamental difference: in football, I was writing to fill in a picture others were already drawing. In youth table tennis, I was writing because nobody else was.

In 2026 I wrote a piece on Kylian Mbappe's speed after France beat Argentina in the round of sixteen. I compiled the numbers myself and got his touches wrong: fifty-four, when the actual figure was seventy-eight according to Whoscored. The piece was widely shared, then a reader pointed out the error. I spent ten days rewatching the full match tape and twenty-seven other matches to verify everything myself.

From that mistake I set a rule: two sources for every number. Never publish a figure without cross-checking it against an independent second source.

Apply that rule to Vietnamese youth table tennis and the problem appears immediately. There is no second source. The only source is the memory of whoever was sitting in the stands, and memory is the worst source of all, because it cannot be checked again.

The whole system can be described with one simple image. Picture an analytics pipeline with four tiers: collection, cleaning, analysis, conclusion. In Vietnamese youth table tennis, the collection tier is nearly empty. However sophisticated the tiers behind it, an empty input yields an empty output.

The worrying part is not the emptiness itself. An empty pipeline does not produce wrong conclusions. It produces counterfeit ones. When there is no data, people do not fall silent; people tell stories. And those stories sound reasonable, persuasive, and travel easily from coach to coach, from article to article.

Looking at a seventeen-year-old player, I have already seen the fractures and the dream. But I can only see that because I keep records. Most of the people with the power to decide do not.

At this point I want to argue against myself, because the case above can too easily slide into a simple slogan: give everyone data.

A youth team short on data is not automatically a training disaster. In many cases, the absence of metrics protects late developers. Centres with dense measurement systems are very good at spotting early bloomers: tall, fast, strong, coordinated at thirteen. And dense measurement systems are equally good at discarding those who fail the standard at thirteen but would surpass everyone at seventeen. I have watched players cut from academies for low physical scores return three years later and beat the very people who cut them.

At a provincial practice hall with no data, people are forced to watch longer. A coach with no dashboard to lean on has to observe a student across many months, many seasons, many psychological states. That kind of long observation carries a value no software replaces.

There are seedlings that do not need the big stadium lights, only a patch of ground warm enough to take root. And the warmest patches I have found are usually in places with nothing to measure.

But I have to flip it a second time. The advantage of a data-free zone is an extremely fragile advantage, because it depends entirely on one individual. When that coach transfers, retires, or simply burns out, the whole dataset — held in his head — vanishes with him. Nothing is handed on. The next cohort starts from zero.

And here is the real dark side: blank space invites fabrication. In an environment with no data, the loudest voice wins. Nobody can rebut a claim that this kid has top-tier hand speed, because no table exists to check it against. The figures quoted in the stands, in the corridor conversations at arenas, in unsourced articles — none can be verified. They survive because nobody has the tool to deny them.

I also have to be fair to the side that has data. Large centres enjoy a real structural advantage, and it is not only money. When a unit can keep five years of a student's competitive history, it can see a curve others cannot. It knows who improves slowly but steadily, who explodes then fades, who is consistent with a low ceiling. That is a genuine management capability, and intuition cannot replace it.

Our problem lies elsewhere: most of the system sits either at too much early data, or at no data at all. Very few places are in between.

Every generation of talent is a geological layer; dig the wrong stratum and you pick up rubble. What worries me is not the speed of the digging, but that we are digging bare-handed and keeping no specimens.

If I could propose one single thing for Vietnamese youth table tennis in the coming cycle, it would not be a new centre, a new tournament, or a new overseas training slot. It would be a form. One A4 sheet, pre-printed, twelve cells, handed to every player under eighteen at every official tournament. The coach fills it in a few minutes after each match. The sheet is photographed and sent to a single archive.

Those twelve cells, after five years, would create something money cannot buy: comparability. You would know whether a player is improving fast or slowly against their own self three years ago, against their cohort, against the country. You would know whether a bad result came from injury, a rubber change, a sudden growth spurt, or simply a better opponent.

None of that requires expensive machinery. It requires a habit, and a place to keep it.

Speed and silence each have their own language; I only write it down. For ten years I have been keeping records on behalf of a system that does not yet exist. I do not write about today's match, but about the person they become afterwards. And I ask myself: if I stopped writing tomorrow, would anyone carry on?