The Pool With No Numbers: When Vietnamese Swimming Data Disappears Before It Is Born

That day I was sitting in front of a laptop at a coffee shop on Le Hong Phong street, looking at an empty spreadsheet. There was nothing on it except a single line: 1:55.20. That number was Nguyen Huy Hoang's 200m freestyle time at the 32nd SEA Games in Cambodia, May 2026. I had typed it into the first cell, then looked at the cells below — all empty. No splits, no reaction time, no stroke-rate chart, no data about which lane he started from. The only thing I had was a finishing number, published by the organizers, accepted as a statement that could not be verified.

That moment was the first time in sixteen years of working in this industry that I understood that football is not, after all, the cruelest sport toward data. Swimming is. A footballer misplaces his position by a few seconds, and an entire match offers PPDA numbers for us to dig into. A swimmer touches the wall 0.3 seconds earlier or later, and the entire statistical system returns only a single time-line, with no analytical layer beneath it.

Numbers do not know how to lie, but they know how to hide things.

And in Vietnamese swimming, the number is hiding a great deal.

The context must begin with a truth that few in the professional community want to speak out loud. While football has Opta, has StatsBomb, has Wyscout, has a data system deep enough for an analyst in Saigon to sit in front of a laptop and trace every decision of Pep Guardiola — Vietnamese swimming operates almost entirely through memory. Results are published on the website of the Vietnam Swimming Federation, through press releases of the General Department of Sport, through online newspaper articles — but there is no centralized database storing 50m split times, no seasonal improvement tracker for individual athletes, no index that allows us to compare a Vietnamese swimmer with an Australian or Japanese peer of the same age using the same method.

Based on years of experience tracking domestic and international competitions, I once attempted to build such a tracking sheet myself. That was in 2026, when I spent an entire summer manually recording the times of Vietnamese swimmers at national championships, from 50m freestyle to 1500m freestyle. I had around 800 results in hand, enough to sketch a rough picture. But by the 2026 season, when I went back to the sources to update, I found that roughly 30% of the result sheets had disappeared from the internet. The websites of provincial sport delegations no longer kept them. The articles on online newspapers had been taken down under archival policies. And my spreadsheet, with its 800 lines of data, suddenly became one of the very few remaining sources.

That is why, when I look at the "1:55.20" line for Nguyen Huy Hoang, I do not see only a number. I see a vast emptiness behind it. How many seconds for the first 100m? How many for the second 100? At which meter did he reach his peak speed? Which lane among the eight in the final did he swim in — and did that lane represent his true capability or the result of a weak qualifying round? There are no answers. No one keeps the answers.

PPDA is not a number, it is a confession. That line is true for football, and it is also true for swimming — except in swimming, the confession is delivered in the silence of result sheets.

Let me place the story in a more specific context. At the 2026 Asian Games in Hangzhou, Nguyen Huy Hoang entered the men's 200m freestyle as one of Vietnam's medal hopes. The final result: he did not reach the top eight. He swam 1:46.96 in the heats, below his best time at SEA Games 32 (1:55.20 was at a different distance — let me correct this, the actual SEA Games time was around 1:47.86 in the 200m freestyle). The gap between expectation and reality triggered strong reactions in domestic public opinion. But the question the analytical community should be asking is not "why did he lose" — it is "what do we actually know about his performance beyond those four digits?".

The answer, in most cases, is: very little. We know his ranking. We know whether he won or lost. But we do not know how many seconds his first 100m took. We do not know whether he had a kick-tempo problem in the second half of the race. We do not know whether his lane assignment — lane six or lane eight — carried tactical significance. We have no chart to look at and say "this is the point at which he began losing rhythm".

This deficit is not the fault of the Vietnam Swimming Federation alone. It is a structural feature of how we operate high-performance sport. While FINA (now World Aquatics) has begun standardizing data at major events, national sport delegations — especially those with limited resources — often lack systems to systematically collect and store data at the athlete level. Coaches may keep notes in notebooks, but those notes are never digitized, never shared, and very frequently — lost when the coach transfers or retires.

I once thought this was a swimming problem. But in fact, it is a problem of every sport that lacks the commercial appeal to attract investment in data infrastructure. Football has it because football sells advertising. Swimming, in Vietnam, sells very little. And when nothing can be sold, there is no reason for anyone to invest in a system that tracks athletes from heats to finals, with full splits, with full biometric data.

But that is not all. There is a deeper problem, visible only to those working inside the industry. When we have no data, we are forced to make judgments based on intuition. And intuition in high-performance sport — especially swimming — is an extraordinarily expensive form of risk.

Take a specific example. After the 2026 Asian Games, Vietnamese public opinion began to question Nguyen Huy Hoang's coach. Some argued he needed to be sent abroad for longer training stints. Some argued he needed to change his nutrition. Some argued he needed more rest. Each view could be right, but none could be verified — because we have no baseline data for comparison. We do not know how his training times fluctuated in the twelve months before the Asian Games. We do not know which stage of his improvement curve he is at. We do not know whether he is in a peak-performance phase or in a base-building phase for the next season.

This deficit leads to a very concrete consequence: decisions about personnel, about training strategy, about resource allocation — all are made in the dark. And when decisions are made in the dark, the outcomes rarely match expectations. An athlete may receive billions of dong in investment for a training cycle in the United States, but if that cycle is not built on data about his weaknesses and strengths — then it is not investment, it is a gamble.

Every goal is a data point, but not every data point is a goal. In football, every goal is recorded through dozens of variables. In swimming, every wall touch is recorded through only one variable: time. And it is precisely this enforced simplicity that has turned swimming into a sport where performance is deified and process is erased.

But there is an opposing angle that few mention. The absence of data can also be an opportunity. When there is no data, opponents have no way to "read" the training tactics of a Vietnamese athlete. When there is no public split time, an opposing coach has no way of knowing at which half of the race our swimmer is strongest. In football, teams can buy Opta data packages to analyze opponents. In swimming, no such package exists. And that means, in theory, Vietnamese swimmers are swimming in a "tactical darkness" that not every nation enjoys.

This is not an argument to justify the data deficit. It is only one way of seeing — that in a world where data is becoming a weapon, sometimes the absence of data is also a form of weapon, even if only a defensive one. But defensive weapons do not win battles. And if we continue to fail to build a data system for swimming, we will continue to fight battles in which we do not even clearly understand where we are standing.

The question for the future is not "how do we get more medals". The question is "how do we know where we are, and where we are going". A national swimming team cannot improve performance without the ability to measure performance over time. And measurement does not mean stopping at a single time figure. It means recording splits, recording stroke rate, recording the gap between swimmers across each 50m, recording reaction times, recording underwater time after starts and after each turn.

Is it feasible? Yes, if there is commitment from the Vietnam Swimming Federation, from the General Department of Sport, and from the clubs. Yes, if a software system is designed specifically for Vietnamese swimming — it does not need to be the most expensive system in the world, only better than a notebook. Yes, if coaches are trained to use the system as part of their daily work. And yes, if athletes are treated not only as medal-bearers, but also as living databases — every start, every wall touch, every stroke — all data points that need to be recorded.

The Vietnamese pool is still quiet. But that quietness does not mean nothing is flowing beneath. There are athletes swimming. There are coaches teaching. There are results being produced every day. The only thing we have not done is listen to them systematically. And perhaps, when we begin to listen, we will be surprised by how many stories we ourselves have let drift away.