The Blank Report: How a Data Blind Spot Is Eroding Vietnamese Badminton

One afternoon in April, I sat down in front of an empty spreadsheet. Twelve columns, not a single number. It was everything I could gather about an international badminton tournament that Vietnam had sent players to — an obscure tournament, exactly the kind I always tell my students to watch: look at the players walking onto court there, because they carry the future behind their backs. This time I saw nothing. No placement data, no faulty-serve rate, no distance covered, not even a complete score record I could verify against. The spreadsheet was as blank as the medical chart of a patient who had quietly left the clinic.

I sat still for a long while. At 56, I am used to data being silent. But there are two kinds of silence, and anyone who reads numbers for a living must tell them apart: silence because the truth is not yet sharp enough, and silence because we have forgotten to write things down. That afternoon's spreadsheet belonged to the second kind. And when a sport forgets to write things down, it does not lose one match — it loses the ability to know itself.

Numbers do not lie, but the person reading them deceives himself for a lifetime. I wrote that line years ago, after a match at Lạch Tray. Today it comes back in another form: when there are no numbers to read, the reader of numbers deceives himself too — by inventing a story that sounds plausible.

A sport running on memory alone

Vietnamese badminton does not lack talent. Nguyễn Thùy Linh once entered the group of the twenty strongest women's singles players in the world according to the Badminton World Federation rankings; Lê Đức Phát is the country's top men's singles player; the next generation keeps collecting medals in Southeast Asia, including at SEA Games held on home soil. But behind those names sits a recording system that is almost pitch-dark.

Based on my experience following matches both at home and abroad, I can say plainly: most domestic badminton tournaments do not produce a single reusable match-data file. The result of a match may live only in a coach's phone, in a referee's notebook, or worse, only in the memory of someone in the stands. Video exists, but the video is meant for social media, not for breaking down into data. A rally lost at the final point is recorded with an exclamation, not with a placement and a racket angle.

In football, the disease is no different. V-League has sponsors, television, audiences, but a match log in the form of open data for analysis remains a luxury. When I worked as a data consultant for a club in Hai Phong, I had to build tables from scratch — counting myself, rewatching tapes myself, defining my own metric system, because there was no source reliable enough to inherit. I became an expert not because I was better than anyone, but because nobody around me was willing to sit down and count.

People often call Southeast Asia the cradle of world badminton, and that is true of Thailand, Indonesia, and Malaysia. What those three badminton nations share is not physique or tradition — it is the habit of archiving. They have player databases, multi-year head-to-head records, and opponent analysis before every tournament. Vietnam sits in the same geography but trails by a whole generation in habit. That gap is not closed by one extra training session, but by a governance decision: choosing to record instead of choosing to forget.

There is a price for this. A sport without data makes decisions by feeling, by relationships, by word-of-mouth stories. Whoever wins is praised for courage; whoever loses is scolded for a lack of spirit. Both judgments are equally cheap, because neither requires evidence.

What was lost when the spreadsheet went blank

With enough data, I could answer very specific questions about a Vietnamese player at an international tournament. What is their tempo at the start of a match? At which shot in a long rally do they lose the most points? How does their scoring rate on a short serve compare with a high serve? How effective is their smash once their stamina passes the sixty-minute mark?

Without data, the only answer I have is: it depends on the match. And it depends on the match is not a conclusion — it is a surrender.

The deepest pain is not that we do not know, but that we cannot detect that we do not know. Without tables, a player who loses three straight games after leading is still recorded with two words: off form. But off form is not the cause; it is the name we give to the fact that we have not found the cause. It might be a breathing problem in the third game, a return of serve read too early, or a mid-match racket change because of a wrist ache no one bothered to ask about.

Forty pages of report go dead silent in a stadium with no applause — but a blank spreadsheet is even more silent, because it leaves no pages for an executive to push aside. What does not exist cannot be faced.

I have witnessed something similar in football back home. In 2026, I published my first data analysis: a club in Hai Phong held its opponent to a draw with just 0.4 expected goals, while the opponent created 2.1, and the equalizer came only from a controversial penalty. The fans called me a traitor. Three rounds later, that club collapsed in exactly the disorganized defensive manner the data had pointed to. I did not feel triumphant. I only felt sad, because with a proper recording culture, no one would have needed a talkative man like me to notice something already lying in plain sight.

The global sports-analytics industry has gone very far. Every badminton serve in major tournaments is tagged, every smash is given coordinates, every footstep is counted by sensors. But the distance between that world and a domestic badminton court is not a technology gap. It is a habit gap. A phone can record images; a small notebook can record points. The problem was never a lack of tools. The problem is that no one believes recording is worth as much as one extra training session.

Here I must add something uncomfortable. When sports data becomes a commodity, it does not flow first toward training centers. It flows toward those who pay fastest — betting companies. Live data supplied to them is the darkest side effect of the digitization of sport. A sport with no archiving culture, once pulled into that stream of money, will very easily learn exactly the wrong thing first.

Silence is not emptiness

Outsiders often imagine data as a neat block: use it if you have it, forget it if you don't. Not true. Data is a living creature; it grows over time, and it can only speak to what it has been taught to see.

I have one rule: before concluding that a player is finished, ask whether the data on him is long enough. A five-match sample is not enough to bury anyone, nor to crown anyone. But when the spreadsheet is entirely blank, we fall into the opposite trap: believing that no data means no problem. The truth lies on the other side. No data means every problem can exist without anyone being forced to see it.

Prediction is not seeing the future; it is reading the dislocation of the present. I said this to a coaching staff after a meeting. They nodded, then asked exactly one question back: so how do we win? — a question no spreadsheet can answer in place of a human being. That is the limit of my profession. But one thing I know for certain: a team that answers that question with feeling will win a few matches and fade; a team that answers with data will win more slowly but last longer.

There is another, subtler temptation. When we begin recording, we tend to record only what is easy to measure. Placement is easy, but fatigue in the seventieth minute is hard. At some point our spreadsheet becomes very detailed and still very blind, because it can measure the racket but not the trembling hand. My job, at its deepest level, is to keep those two things side by side: the measurable and the unmeasurable. Dropping either is self-deception.

I have also fallen into the trap of romanticizing models. One season, I fell in love with a high-pressing model in Europe and wrote a long paper urging the home club to replicate it. The result: the wingers were exhausted after sixty minutes, the team lost consecutively. The board called me into a meeting, and all I could do was hold a list of physical data no one had asked for. Since then, every analysis of mine carries a mandatory section: the preconditions for applying it. Data that is right in one environment is not necessarily right in another; an imported model without importing the institution behind it is just wordplay.

A thought moving forward

That afternoon's spreadsheet was still blank when I closed my laptop. But I did not walk away feeling it was useless. Because a blank spreadsheet, looked at long enough, becomes a question — and a question is never useless.

What I want to leave behind is not a call to buy technology, but a far humbler habit: record. Record before you understand, record even when you see no need, record things that seem meaningless. A badminton nation does not need to wait for a perfect data system to begin. It only needs one person willing to sit down, open a notebook, and write the first line.

At 56, I no longer believe in numbers — but I believe in the way numbers get betrayed. And the most brazen betrayal of data, past and present, is not a faulty algorithm, but the silence of those who should have been writing things down.