Vietnamese Swimming and the Seven Empty Columns: When a Result Sheet Says Almost Nothing

On my desk is a results sheet printed from the organisers' control room: one column for the final time, and seven empty columns beside it. Those seven columns should have carried the start reaction, the 15-metre underwater segment, the turn split at every wall, the stroke rate, the average distance covered per stroke cycle. A race lasting under two minutes was reduced to a single string of digits. The coach sitting next to me, with nearly twenty years in charge of a squad, glanced at the sheet and said: "Knowing the time is enough." I did not argue. But on the way home I kept thinking about those seven empty columns.

After twenty-five years in the trade — starting as a swimming reporter, then moving fully into sports data analysis — I have arrived at something that sounds trivial: the distance between a number that is recorded and a number that can actually be read is enormous. A final time answers who touched first. It does not answer where the winner won, how, or whether that way of winning is repeatable.

Based on my experience tracking meets and major championships, this is the fundamental difference between swimming and most team sports. Football has built an entire index system to measure what the scoreline omits. In swimming, everything outside the clock remains largely a dark zone. Partly because the sport is so tidy that it invites the assumption that one number is all you need.

The problem is not a shortage of data. It is that data is being captured at the wrong level. We record the final output of a four-phase process — start, underwater, turn, finish — and then argue about that process using a single data point about its output.

The event determines the rule set

In swimming you cannot speak of "technique" in the abstract. Every event carries its own rule set, and that rule set shapes how a performance should be read.

Breaststroke permits exactly one dolphin kick after the start and after each turn. Freestyle and backstroke cap underwater travel at the 15-metre mark; exceeding it is a foul. These two rules create two entirely different technical worlds. In freestyle and backstroke, underwater travel is one of the largest sources of advantage, because a swimmer moves faster under the surface than when surfacing into stroke. In breaststroke, value sits in rhythm and cycle length rather than in glide distance.

If the results sheet does not record the 15-metre time, we do not know where the swimmer generated the advantage. If it does not record turn time, we do not know whether the winner actually turned well or simply swam the middle segments faster. And without stroke rate and distance per stroke, we cannot separate two fundamentally different approaches: raising tempo to hold speed, or holding tempo and extending the stroke.

One identical final time can come from two opposite technical structures. That is exactly where the sheet falls silent.

Performance coordinates: where a result sits in history

Placing a performance correctly requires at least three coordinates: the world record, the all-time list, and the current-season ranking. Each answers a different question, and missing one produces a misreading.

One factor is routinely overlooked: the suit era. After the international federation banned high-tech polyurethane suits in 2026, the global performance baseline shifted appreciably. Records set before that carry a different comparative value from marks set in the textile era. Placing them side by side without annotating that context is an invisible form of distortion.

At the selection level, major meets use two standards. The A standard grants direct entry; the B standard depends on quota allocation. For a nation holding few slots, the gap between those two levels determines the entire competitive strategy: concentrate resources on a specialty event, or spread them in search of an opening.

Without splits, there is no tactics

In swimming, the sequence of segment times replaces every possible word of tactical commentary. It immediately reveals whether a race was built on a back-half surge or on an early burn that faded over the final 25 metres.

Two swimmers separated by two-tenths of a second may have swum two entirely different races. One started well, travelled far underwater, then flattened. The other started slowly, turned better and surged late. The result looks the same, but the development direction is opposite: the first needs an aerobic rebuild, the second needs a start rebuild. Without splits, both diagnoses collapse into one vague sentence: "lost by two-tenths."

This is why adding splits at domestic meets is far cheaper than hiring another coach. A single automatic timing system, or a small group of officials assigned to record each wall, produces enough data to change how an entire generation of swimmers is evaluated.

The power map and the talent supply chain

There is no single map of world swimming. There are several maps layered on top of each other, one per event. Some events are held by a handful of individuals across multiple cycles. Others remain in permanent melee, with the title changing hands continuously.

What matters for us is the talent supply chain. Strong swimming nations organise development along three main models. The American collegiate model lets athletes compete while studying, extending careers and retaining late developers. The centralised national model concentrates resources on a few priority events but tends to miss the sprint disciplines. The dispersed club model is durable but depends on private capital.

Vietnam does not fully belong to any of them. Most swimmers come up through national sports training centres, with a few cases moving into overseas training programmes. That structure produces occasional peaks but not density. Peaks attract attention. Density generates durable strength at regional level.

Another signal is under-discussed and increasingly important: sporting nationality switches and coach migration. Every time a foreign specialist arrives or departs, the trace shows up in the record sequence of at least one group of swimmers, usually one to two cycles later.

Governance: competition rules and anti-doping

Here, the essential discipline is tiering. Four distinct situations must never be collapsed into one concept: a confirmed positive test, a contamination dispute, a procedural violation, and a mere accusation circulating online. Each carries very different legal and professional consequences.

The international swimming federation, the World Anti-Doping Agency and the Court of Arbitration for Sport form three separate tiers of handling. A case may stop at the first tier, or run through all three over several years.

I state this for one professional reason: silence in the data is not evidence of a violation, and it is not evidence of compliance either. When information is absent, the only correct answer is: cannot yet be assessed. Analysis as a trade survives on the willingness to write that sentence.

The career curve and the puberty barrier

In swimming, the single most important screening factor for teenage female athletes is the puberty barrier. During that phase physical change can stall or even reverse performance, with training volume completely unchanged. Many swimmers who were very fast at fourteen or fifteen disappear from finals by eighteen.

Nguyen Thi Anh Vien is a revealing counter-case: she sustained a regional peak across multiple cycles, across multiple Olympic appearances, and expanded her event range rather than narrowing it. Nguyen Huy Hoang represents another direction — specialisation in distance events, where speed is not the deciding factor but aerobic base and pacing discipline are. Tran Hung Nguyen, in the medley, belongs to the group that needs technical breadth and absorbs the pressure of switching between four strokes.

Those three curves require three different evaluation frameworks. Applying a single yardstick is the fastest way to miss talent.

Public narrative and the expectations gap

Whenever a young athlete posts a strong result, the "successor" label appears instantly. I have tracked such labels across many sports for years. Their hit rate is far lower than the crowd's intuition, because they are attached to very small samples — usually a single meet.

The gap between expectation and reality is not harmful in itself. It becomes harmful when it is used as a substitute for evaluation. An athlete can be the revelation of one season and still be an entirely reasonable long-term project.

When the stands are empty, every model collapses. I rebuild from the half-burnt data. The behind-closed-doors period during the pandemic was a case in point: it showed that many seemingly solid conclusions about home advantage and match tempo were true under exactly one condition — that there were spectators.

Ripple effects across the industry

A major performance does not create a moment only. It creates a market.

Upstream, the star effect pushes children into learn-to-swim classes, most visibly within eighteen months of a major championship. Midstream, it shifts athlete movement between training centres. Downstream, it changes the value of events, sponsorship contracts and equipment lines.

The transfer market is the only place where people pay for expectation rather than for present output. In swimming, that money flows more through personal sponsorship and scholarships than through transfer contracts, but the nature is the same: buyers purchase a future curve, not a past result.

The blind spot: when data is empty, we invent stories

My professional reflex is to fill the gap. Looking at seven empty columns, I want to infer. Looking at a swimmer who has never turned well, I want to write a headline. Looking at a final with six medal contenders, I want to construct an era.

I once treated models as scripture. Now they are only a compass — but without one, we are lost. The difference is this: a compass gives direction; it does not license me to claim I have arrived.

The biggest blind spot in domestic swimming analysis is not technical expertise. It is the blurring of correlation and causation. A training centre producing many good swimmers does not prove its programme is right; it may simply have recruited a better cohort. A nation suddenly winning a sprint medal does not prove it has just completed a system; it may just be that one exceptional individual appeared at the right moment.

Numbers do not lie, but people always find ways to lie with numbers. The most common way is to use a small sample and speak as though it represented a population.

For me, the real discipline of anyone holding data is the willingness to write three words: cannot yet be assessed. It is not exciting. It does not spread. But it is what keeps every downstream conclusion worth anything.

Reputation is only a name. What endures is always the way you read the race.

Signals to watch in the next cycle

Three signals I will be watching at upcoming meets.

The first is the appearance of splits in official results. If domestic meets begin recording every 25-metre segment, the entire evaluation method changes within two to three seasons.

The second is whether training centres publish baseline athlete data. Nothing biometrically complex is required — age, height, number of events per season and injury frequency are enough to reconstruct a career curve.

The third is how media write headlines. If "successor" labels are still being attached on the basis of a single meet, we know we are still reading the surface.

What I want to know is not who wins the next meet. I want to know whether, next season, the sheet in my hand will still carry seven empty columns.