The Data Gap in Vietnamese Martial Arts: What Nobody Measures, Nobody Keeps

In the notebook I carried through SEA Games 31 in Hanoi, one page holds only three numbers: 14, 3 and 0. Fourteen combat sports bouts I watched from the first round to the referee's raised hand; three bouts with detailed scorecards made public; and not a single bout with punch or strike counts broken down by round. Every sports story begins with a forgotten number. Here, the notebook was never opened, so there is no number to forget.

Fans remember the medal. I remember the blank lines in the bout report.

Vietnam owns a martial arts tradition far deeper than any medal table suggests. Vovinam was founded in 2026 in Hanoi by master Nguyen Loc and has appeared repeatedly in the SEA Games programme. Around it sit traditional martial arts, wrestling, amateur boxing, and a professional boxing generation that has emerged over the past six or seven years. Each discipline has events, federations, coaches, state funding and corporate sponsorship.

Nguyen Thi Tam once competed at the Tokyo 2026 Olympics. Truong Dinh Hoang is a leading name in the domestic professional boxing wave. For both, what I can retrieve is still only a final result and a few lines of newspaper copy.

When I dug back into the records of a fighter who reached a final six years ago, the only intact material was a four-hundred-word article and a two-minute clip on social media. No round-by-round report. No weight before and after the cut. No count of rest days between appearances. Nobody preserved what would become evidence a decade later.

When the stadium empties, the person inside finally speaks. I learned that during COVID-19, interviewing fifteen former J-League players about competing without crowds. What threw them off rhythm was not the silence but the artificial applause pumped through the speakers. Yet that interview was only possible because every match in Japan leaves a trace: minute, tempo, distance, touches. To hear the silence, you first need a record.

In 2026, as a data analysis intern at DAZN Japan covering the J-League, I used tracking data from twelve matches to show that a table-topping team's expected goals were nearly forty percent below the chasing pack. The internal argument ran for two weeks. What I kept from it was not who was right, but a habit: before arguing about style, check whether there is anything to compare against.

With Vietnamese martial arts, the answer is usually no.

Three layers of missing data

The first layer is bout data. In international professional boxing, the three judges' scorecards are published, including the controversial ones. In domestic combat events, what gets published is usually just the final result or the winner's name. Nobody knows who took round two, which fighter raised the tempo in the fourth minute, who faded in the seventh. If a fighter is suspected of winning on a bad decision tomorrow, we have no data to check it against — only the memory of those sitting closest to the ring.

The second layer is body data. Weight cutting is the darkest part of any combat sport with divisions. I once watched a fighter drop four kilograms in thirty hours, and that story survives only as speech, not as a single figure. Resting heart rate, recovery time after a bout, average seasonal weight loss — these are indicators that can save a career, and we do not measure them.

The third layer is career data. How many national-team fighters retire before thirty? How many return to competition within a year of a ligament injury? What is the recurrence rate? Nobody can answer, because nobody asks the question that way.

What is lost is not measured in medals

A sport without data can still win medals. The loss lies elsewhere: coaches have no basis for disagreement, fighters have no evidence when they protest, and writers like me are forced to build stories out of feeling.

Looking at Japan, the first impression easily leads to the wrong conclusion. People say the Japanese are meticulous and the Vietnamese improvise. That explanation is a cliché and helps nobody. Kodokan opened in 1882 and has kept continuous records ever since; that is the achievement of an institution that survived generations of war, crisis and changes of ownership, not of a national character. Sumo has preserved per-tournament rankings for centuries because nobody has the authority to break that continuity. The gap between the two martial arts worlds lies in record-keeping infrastructure and the incentives that sustain it.

The counterintuitive part

There is an unspoken assumption that missing data is caused by laziness or a lack of technology. I do not believe it. That gap is maintained by interest: most of the data is absent because someone decided not to record it.

A federation funded according to results at major games has an incentive to count medals, not to file round-by-round reports. A coaching staff judged on final outcomes has no reason to disclose weight cutting, injury recurrence, or an eighteen-year-old fighter already showing signs of brain damage. I believe in data, but I write about what data cannot measure — and I also recognise that what goes unmeasured is often what nobody wants to see.

The media shares the blame for the silence. We celebrate the raised hand, replay the pretty strike, then close the page. When everyone looks at the victory, I look for where the weakness was hidden. But to look, there must be something to look at.

We need a boring ledger

The first step is not buying a tracking system or hiring a foreign analyst. The first step is a public, boring, complete database: every domestic bout, every scorecard, every weigh-in, every injury, updated consistently for twenty years.

Breaking convention does not require a loud voice; it requires evidence heavy enough. A ledger kept seriously for two decades will weigh more than any argument on social media. It is also the only way the next generation of fighters does not have to start again from zero — in the literal sense.