The Empty Dataset of Vietnamese Table Tennis

The Empty Dataset of Vietnamese Table Tennis

The file I opened contained eleven matches. Seven of them carried no point-by-point record at all — no game-by-game score, no breakdown of points won on serve, no average rally length. All that survived was two names and a final score. The coach who sent it added one short line: that is as much as domestic events record.

The same morning, I opened the feed from a WTT event. Two minutes of broadcast returned ball speed on every rally, spin rate, rally length, placement, and a service analysis split into five landing zones. A single international semifinal generates more data than an entire national season.

That gap repeats across almost every table tennis nation outside the leading group. In Vietnam it leaves one very concrete consequence: every domestic argument about table tennis is conducted from memory, because nobody has anything else to put on the table.

Table tennis is the sport with the densest point frequency among combat sports, and also the sport with the thinnest record. A seven-game match can exceed sixty points. Each point lasts a few seconds. Each point is a complete chain of technical decisions about serving, receiving, placement and rhythm. In theory, this is the richest data mine an analyst could wish for.

Reality runs the other way. Table tennis is played in discrete points with a small denominator — eleven points in a game, four games in a match — so the error margin on any metric is large. Most events have no automated tracking. Rally-level scoring records are almost never published. And no common standard obliges federations to open raw data.

The result is a sport whose public debate runs on the weakest evidentiary base among popular disciplines. Vietnamese team sports have already begun to gain their own data providers: football has match-level stat sheets, basketball has possession-by-possession play-by-play. Table tennis, with a denser point frequency than either, still stops at the final score. The sport easiest to record is the one recording least.

The rulebook changed five times in fourteen years, and none of it was measured

According to ITTF's published record, the ball diameter rose from 38mm to 40mm in 2026. In 2026, matches moved from 21-point games to 11-point games, with service changing every two points instead of five. In 2026, the hidden-serve rule took effect. In 2026, solvent-based speed glue was removed from elite play. In 2026, celluloid was replaced by plastic.

Each change was argued with a clear objective: more television appeal, longer rallies, less advantage to the server, better protection of athletes' health. The actual effect on point distribution has never been published as open data. What remains are qualitative conclusions: a bigger ball reduces spin, shorter games raise variance, the glue ban changes power mechanics.

Put another way, table tennis rewrote its rulebook five times in fourteen years without producing a single benchmark dataset to measure those very changes. The problem is not that table tennis lacks data. The problem is that table tennis made the largest structural interventions in popular sport while attaching no measurement mechanism to them.

The 2026 plastic ball is the clearest case. When celluloid was replaced, flight trajectory, bounce and spin grip all shifted. Training centres worldwide adjusted their programmes within months. In Vietnam the adjustment happened too, but no dataset recorded the speed of adaptation: how many players needed six months, how many needed two years, how many never recovered their old power mechanics. That is data collectable with a simple spreadsheet. It was never collected.

A rule structure that can actually be measured, and what it teaches about the rest

Since WTT launched in 2026, the ranking system has run on a rolling 52-week window, counting a limited number of best results, with attendance obligations attached to certain tiers. This structure creates what I call points-defence pressure: a player competes against the opponent in front of them, and simultaneously against the point totals about to expire from their calendar.

Here data exists, and because it exists, the right questions can be asked. Should a player skip a lower-tier event to concentrate fitness on a higher-tier one and accept a short-term points loss? That question is answerable with numbers, because both sides of the equation sit in a public table.

Vietnam's national level has no such table. No internal ranking against a fixed standard is published on a regular basis. No head-to-head win rate within a peer group. No deciding-game data. Where there is no scoreboard, there are no correct questions.

The gap between what is remembered and what is recorded

I once sat through nearly two hours of two coaches arguing over which generation of Vietnamese table tennis was stronger. The names raised — Đoàn Kiến Quốc, Mai Hoàng Mỹ Trang, Nguyễn Anh Tú, Đinh Quang Linh — all belong to the group that left a mark at regional level. The argument had no comparison standing behind it: no win rate against peer opponents, no deciding-game win rate, no point distribution by phase of game.

That argument ended in feeling. It always ends in feeling.

In 2026, as a first-year student, I wrote my first analytical piece using expected goals on a domestic football match. It drew 32 reads. A young coach left one comment: you see the match differently from the rest of the press. I understood then that data does not make a piece better written; it makes the piece see what the naked eye walks past.

The consequence of the data gap lies not in the writing trade but in the selecting trade. When a federation decides who travels to an international event, the heaviest criterion is usually recent form — a concept with no quantitative definition. Form becomes a variable assessed by eye. Every variable assessed by eye is governed by the most recent meeting, by reputation, and by who sits near the person deciding.

For the youth group, the gap is wider still. A federation wanting to know whether the current U18 cohort has depth needs a minimum of three numbers: athletes in the age band, conversion rate to the senior team over three years, and level distribution by rating group. Without that trio, every claim about the next generation is guesswork.

The contrarian angle: the trap of imported metrics

One muscle of the data gap is bringing metrics across from other sports. Expected goals in football was built to model a low-tempo, twenty-two-player, low-scoring environment with many variables outside any individual's control. Table tennis has a completely different structure: closed scoring, self-contained rally chains, a small denominator and large error margins.

xG is not a rebel; it is a mirror reflecting our own biases. Importing it into table tennis without restructuring produces numbers that look tidy and answer nothing. The worst class of mistake in my trade is the mistake that dresses well.

The same family of error is the overuse of video review. At some events, each player is granted a limited number of challenge requests on disputed situations. In principle it reduces officiating error. In practice, every stoppage cools the rhythm of the match, and in a sport where points live on rhythm, that cost appears in no stat sheet at all. We can count the reviews. Nobody has counted the points lost afterwards.

Numbers never lie; only the person reading them lies to himself. When there are no numbers at all, the right answer is not a confident estimate. The right answer is a blank page with an honest label on it.

Data is the confession of those who once trusted their feelings. But a confession only counts when it rests on what happened, not on what we wish had happened.

What to watch in the next cycle

Form is an illusion; only a sequence of numbers is a real current. Over the next twelve months, the signal worth tracking is not medals. It is whether any domestic event publishes rally-level scoring data, whether an internal ranking system on a fixed standard appears, and whether a player can be selected or dropped on a spreadsheet rather than on one viewing.

Based on my own experience watching these matches, I expect that to arrive later than one SEA Games cycle. When the whole world shouts emotion, I choose to listen to the chart — even when the chart is empty.