Vietnamese Table Tennis: The Cost of an Empty Spreadsheet

The seventh game ended 12-10. A 22-year-old player dropped to the floor of the arena; his opponent stood still and watched the ball roll into the corner of the table and stop. The stands rose to their feet, applause bounced off the ceiling, and then everything settled within three minutes. I stayed behind after the spectators had drifted out, opened my laptop, and realised the final column of my spreadsheet was still empty. Nobody had recorded the average number of strokes per point. Nobody had logged the win rate of the champion when a rally stretched beyond seven strokes. Nobody had written down that he won six of the last eight points with cross-court attacks into the left corner — something anyone in the hall that day could see, but no system kept. A national semi-final, seven games, more than a hundred points, and the most valuable slice of data evaporated the moment the umpire called the match.

Professional table tennis runs on an entirely different logic. The International Table Tennis Federation world ranking is calculated from a player's eight best results over twelve months and updated weekly. Points do not last forever: on a fixed date a title is deducted from the record, the ranking position drops, and the seeding for the next event drops with it. The WTT Series pyramid runs from Grand Smash down through Champions, Star Contender, Contender and Feeder, each tier carrying its own points and prize money. That structure forces every federation to do something Vietnamese table tennis has not managed at national level: archive the detail of every match, every point, every rally.

For a Vietnamese player, every ranking point is a term deposit. Points earned at a continental event this year expire in the same month next year. Without a dense enough domestic calendar to fill the gap, a player must travel abroad at their own expense or accept the slide. Points-defence pressure is not an abstract idea. It is flight schedules, hotel bills, and the decision whether to spend energy on a low-value Feeder event or save the legs for a bigger continental tournament.

This is where I want to slow down, because it explains most of what we see on the table. Over the past three years I have logged more than six hundred matches involving Vietnamese players at national level, at the SEA Games and at open international events — with no software, just a notebook and a spreadsheet. From that dataset one pattern repeats often enough for me to say it out loud: when a rally ends inside the first five strokes, Vietnamese players win roughly 55 percent of points against foreign opponents of comparable level. When a rally passes nine strokes, that figure falls below 40 percent. The gap barely moves across seasons, across generations of athletes, and across coaching changes.

The meaning is not that fitness is weak — a conclusion anyone can reach after watching a long defeat. It sits elsewhere: if most points in a match are decided inside the first three strokes, the prevailing ratio in elite men's table tennis, then spending most training time on long rallies is a misallocation of resources. In the women's game, where rallies run longer and the share of points decided in the first three strokes is markedly lower, the same training plan may be perfectly sound. No single number speaks for itself; only the comparison between numbers produces information.

The most worrying thing about Vietnamese table tennis is not a shortage of good players; it is the absence of a shared data standard for knowing where the strength is, where the weakness is, and whether the programme is advancing or standing still.

Let me make that concrete with three metrics any national squad can record within thirty minutes of a match. First, the win rate inside the first three strokes, split separately for service and receive situations — two fundamentally different situations that are usually mashed into one meaningless figure. Second, the distribution of rally length, grouped into one to three strokes, four to six, seven to nine, and ten or more. Third, the win rate in the decisive phase, specifically from the eighth point onward in each game.

None of those metrics requires high-speed cameras, artificial intelligence or an analytics department. They require one person sitting beside the table with a ruled sheet of paper, and an agreement that every event in the national system records in the same way. The cost is close to zero. The value compounds, because after three seasons a federation would hold a dossier thick enough to answer questions currently settled by gut feeling: which player is genuinely improving, which coach is actually changing a playing style, which youth cohort is on the right track.

At athlete level, the data gap creates a nameless kind of pressure. Vietnam's leading players such as Nguyen Anh Tu, Dinh Quang Linh, Tran Tuan Quynh and Nguyen Thi Nga all have match results recorded on international systems — date, opponent, game-by-game score. But behind those figures sits a blur: how they won, how they defended, and which weakness an opponent exploited in the last three meetings. When a player steps up to the table without knowing that an opponent has beaten him three times before with a sidespin serve, he is gambling on his own memory.

Numbers do not lie, but they know how to make people lie to themselves. In analytics circles there is a temptation called modernisation by spreadsheet: gather enough data and the team will improve automatically. I fell into that trap, and I have a concrete example with which to indict myself. Last season I compiled data on a young player and concluded his backhand was a fatal weakness, based on a high loss rate in long rallies. When I went back to the video, I discovered my dataset had accidentally omitted every match he won quickly inside four strokes — meaning I had measured his weakness using only the matches where he faced far stronger opponents. My conclusion was very tidy, and entirely wrong.

Correlation is not causation, and in table tennis the trap appears everywhere. A player with a high three-stroke attack rate does not necessarily have good service technique; he may attack early precisely because he lacks the confidence to enter a long rally. A squad with an impressive decisive-point win rate does not necessarily have mental steel; it may simply have led early in most of its matches. Data is only valuable when we ask the right question, and the right question almost always begins with why, not with how many.

Emotion is noise in a dataset, but noise past a certain threshold becomes signal. In the semi-final I described at the start, the loser had led 10-8 in the seventh game. Watched with the naked eye, it was a psychological collapse. Watched through data, it may have been a purely tactical problem — he kept the same service pattern he had used all match, and the opponent read it. Without data, we will argue forever about nerve, a beautiful word that cannot be measured. And when a table tennis ecosystem argues with unmeasurable words, it is persuading itself that the problem is spiritual rather than methodological.

I do not believe in miracles; I believe in the probability attached to the shirt. The signal to watch in the next cycle is not medals, but whether anyone inside the national system is willing to sit down after each match and record those three metrics. If they do, in three seasons every debate about the national team will have ground to stand on. If they do not, we will keep sitting down after 12-10 games, staring at an empty spreadsheet, and telling each other the story of a player who lost his composure.