Vietnamese Swimming: The Numbers That Never Reach the Scoreboard

Hook

At the seven-hundredth metre of the 1,500m freestyle, the swimmer's stroke rate held steady at around 38 strokes per minute, but distance per stroke had collapsed from 2.15 metres to 1.94 metres. No red light flashed on the electronic scoreboard, no commentator shouted, and no one in the stands noticed anything unusual. There was only a quiet data signal saying the race had turned long before the touch pad. Numbers never lie, but they know how to hide.

In my line of work, people only look at two things: the final time and the ranking. Both are results, not causes. And results, as anyone in the transfer market knows, are the last thing to be published, long after every important decision has already been made.

Context

I started covering swimming in 2026, when I was a beat reporter on the swimming desk of a newspaper. Back then every analysis stopped at "swimmer A posted time X". It was only after I moved into transfer-market administration and settled in Nha Trang that I understood the real gap between swimming nations lies not in peak times but in the ability to repeat them.

A swimmer can go fast once. A swimming nation is only strong when dozens of swimmers go fast consistently, and, more importantly, when they can handle the pressure of heats — where there are no medals, only tickets. Heats are where the real data surface, because there is no pacing strategy, no sense of a guaranteed spot, only the clock and the wall.

Vietnamese swimming sits exactly at that junction. We have individuals good enough to reach continental thresholds — Nguyễn Huy Hoàng is the clearest example in the 1,500m freestyle, while Nguyễn Thị Ánh Viên was once the benchmark across several medley events before retiring. But we do not yet have a system that produces them regularly. Each talent appears as a lone star, not a constellation. That is why I always reopen split data rather than simply reading the final time.

Core

Start with the number scoreboards hide best: split structure.

A 1,500m freestyle swimmer at Olympic standard usually keeps the gap between the first 100m and the last 100m within 4–6 seconds. When I compile the swims of Vietnamese athletes at regional and continental meets, that gap usually falls between 7 and 10 seconds. In other words, our swimmers are good over the first half, then free-fall over the second.

This is not about "character". This is about energy distribution and an anaerobic base. A swimmer who loses 9 seconds over the final 100m is not short on will; they are short on the ability to hold power once blood lactate has crossed the tolerance threshold. I often tell coaches they are training the "peak" while forgetting to train the "tail".

I once calculated the same index for a standout Vietnamese swimmer and found closing acceleration down 38% on the previous season. I posted a warning that this athlete would fade after the 1,000m mark at major meets. The reply was an angry line: "Don't sit in Nha Trang and talk about the pool." A few months later, at a continental meet, exactly that scenario unfolded. It is the kind of confirmation nobody wants to be right about.

There is a common misunderstanding here. People read a "100m freestyle time" as a strength index. But in distance swimming, peak short-course speed does not predict a 1,500m result. What predicts it is lactate threshold and efficiency per stroke. Two swimmers with identical 200m times can be 15 seconds apart over 1,500m, simply because one holds stroke length while the other just keeps slapping the water.

Stroke rate and distance per stroke are compensating variables. A swimmer can raise stroke rate to cover lost stroke length for a short while, but the price is a spike in oxygen cost. That is why the stroke-rate curve of a good distance swimmer looks flat, while a raw one looks like a stock chart.

Turn efficiency is another overlooked index. Over 1,500m a swimmer performs roughly 29 turns. If each turn costs an extra 0.15 seconds against standard, the total loss exceeds 4 seconds — exactly the gap between a place in the final and a ticket home.

And here is the sorest point for Vietnamese data: we have virtually no standardised split data for domestic meets. When COVID closed the pools, I sat down and built a multi-season dataset covering hundreds of swimmers, and found that most national meets record only the final time. No splits, no stroke rate, no distance per stroke. We are running a swimming nation without a map. COVID shut the pools, I reopened the data. No meet is meaningless.

What is worth noting is that this problem can be solved at very low cost. A fixed camera at the wall, free stroke-counting software, a properly built spreadsheet — those three things could change how we see a swimmer. But the biggest change is not in the tools, it is in the habit of record-keeping.

Contrarian

Here I have to say what no one wants to hear.

Most people believe that for Vietnamese swimming to break through, it needs one extraordinary talent — a "second Ánh Viên" or a "second Huy Hoàng". I think that is backwards. An extraordinary individual is the result, not the cause. What we lack is not genius, but a measurement system.

A strong swimming nation is built on three things: split data at every level, a talent-identification system based on indices rather than instinct, and a culture that accepts uncomfortable numbers. As long as we cling to the attitude of "always encourage, never criticise", we are blindfolding ourselves to our own weaknesses.

There is an interesting paradox: distance swimmers are precisely the group most easily misjudged. A swimmer who finishes eighth but with a better split structure than the third-place finisher may be the larger long-term asset. But the scoreboard only shows ranking. People look at the price tag, I look at the curve. Many talents die before they are ever announced.

And please do not forget the human side. An athlete branded a "failure" by their own hometown media after a single heat will carry that wound into every subsequent dive. Data helps us see more clearly, but it does not license cruelty. I verify this through direct conversations, not through spreadsheets.

Takeaway

So what signals should we track in the coming round?

Look at the gap between the first half and the second half, not the final time. Look for whether any national meet begins publishing split data — that will be the real milestone. And watch the young swimmers whose distance per stroke rises season after season; that is a sign of technical foundation, not of luck.

Luck is something I do not have. I have probability and data thick enough to stand on. A championship roster is not built in the wallet, but in the way time is compressed into indices — and Vietnamese swimming, to this day, still has far too much time left uncompressed.