Vietnamese Volleyball and the Empty Cells in the Stat Sheet

A nine-page analysis report sits on my desk in Osaka. Each page covers one topic: tactics, data, competition system, governance, personnel, risk, media. And every empty cell is filled with the same sentence: insufficient information to assess.

No competition named. No team named. Not a single figure for spike success rate, blocks per set, or perfect-pass percentage. Nine pages, nine analytical frameworks, and nothing whatsoever to analyse.

What made me stop was the way it was empty: tidy, properly formatted, with tables, a table of contents, a conclusion section. A perfect scaffold built to hold something that never existed.

I looked at it for a long time, because it resembles something I meet every week in this job: Vietnamese volleyball analysis that comes into being from the belief that data must exist somewhere, when nobody has actually held it in their hands.

A sport moving faster than its data infrastructure

Over the past four years, Vietnamese women's volleyball has changed faster than in any period I have covered. The national team has won matches people previously only dared to imagine, and in the summer of 2026 the team stepped into the FIVB Volleyball Nations League for the first time — a stage where every rally is recorded, every metric published, every player placed under a microscope.

At one end of the information pipeline is that tournament. At the other end is the domestic national championship, where a match usually leaves the public exactly three things: the set scores, the name of the top scorer, and a few lines of impressionistic commentary.

Trần Thị Thanh Thúy understands that distance better than most. During her time with PFU BlueCats in Japan's V.League, she lived inside an ecosystem where every match generated hundreds of data points: reception attempts, reception positions, attack efficiency by court zone, block touches. When she returned to the national team, she walked into an environment where those very metrics vanished from public view.

Names like Nguyễn Thị Bích Tuyền or Nguyễn Khánh Đang are discussed far more on social media than in any report accompanied by figures. That asymmetry does not belong to the players. It belongs to an information system that was never built to answer what fans want to know.

Pressure rises with results. Every time the national team wins a big match, the number of articles about them multiplies far beyond the number of people who were actually inside the arena. The distance between writer and source data grows, and each time, another layer of interpretation is stacked on the one before.

Taking stock of what we actually have

Over the past three weeks I sat down and built an inventory: for each basic volleyball metric, is the information actually published publicly, at three levels — Vietnam's domestic championship, Japan's V.League, and the FIVB VNL.

| Metric | Vietnam domestic championship | Japan V.League | FIVB VNL | |---|---|---|---| | Points by set | Yes | Yes | Yes | | Attack efficiency by court zone | Not published | Yes | Yes | | Block touches | Not published | Yes | Yes | | Perfect-pass rate | Not published | Yes | Yes | | Digs by position | Not published | Yes | Yes | | Rallies per set | Not published | Yes | Yes |

This is the only table in this piece where I will vouch for every cell, because it does not measure players — it measures the transparency of organisers.

And it reveals something uncomfortable: the problem lies in the raw material. We are telling good stories with the thinnest possible fragments of data.

When a metric does not exist, three substitute mechanisms appear immediately, and all three show up in print with regularity.

The first is idolisation. A player who scores 25 points in a big match is called the engine, the soul, irreplaceable. But those 25 points came from how many attempts? If 60, efficiency is under 42 percent. If 45, efficiency is above 55 percent. Those two numbers describe two entirely different players, and none of us knows which one we are talking about.

The second is concluding from a single rally. One one-handed dig at the end of set five becomes character, experience, class. I have rewatched many such rallies. Most were late reflexes after a wrong first step — something that, with positional data, a coach would see immediately and correct in the next training session.

The third is importing metrics without context. Someone cites a 62 percent perfect-pass rate from an international tournament and applies it directly to the domestic league, without noting that "perfect" is defined differently everywhere: some count a ball reaching the setter inside the three-metre zone, others only count a ball arriving in the exact position to run a quick attack.

Over the past two seasons I asked to see internal reports from three women's clubs. All three shared one trait: the primary analytical tool is still an assistant coach's notebook. What gets recorded — a wrong reception position, a misaligned approach, a missed block assignment — is accurate and valuable. But it lives in the notebook, not in a machine. A player changes clubs and the entire record of her disappears from the system.

What the stat sheet does not say

There is a technical reason volleyball is harder to measure than many sports, and it is usually skipped in arguments about numbers.

Volleyball is a sport of dependent chains. A successful attack begins with a stable first pass, passes through a sensible set, through a correctly timed approach. If only the final outcome is recorded — point or no point — the whole chain is compressed into one number, and every error inside it disappears.

That is why in video sessions I always start behind the score. The number of extra steps a libero takes before contact. The gap in fractions of a second between the ball leaving the setter's hands and the attacker's hand meeting it. The number of times a middle blocker is drawn to the setter and leaves her zone open. None of those appear on the scoreboard, yet they decide almost the entire match.

Sayaka Aoki's footwork that day was not about speed; it was about what people choose not to see. I learned that at a university track meet in 2026, and it holds for volleyball exactly: most of the decisive information sits in cells nobody bothers to open.

There is an ethical consequence to how we read metrics. When an attacker has low efficiency, the most common reading is weak mentality. That reading ignores three entirely measurable things: the quality of the first passes she received, how many out-of-system balls she had to attack, and how often the opponent placed two blockers in front of her. Labelling a personality onto a number is the fastest way to stop analysing.

At youth level the gap is wider. National U20 and U23 tournaments publish almost nothing beyond scores. The consequence is that a player arrives in the senior national team with no baseline against which to compare herself with herself two years earlier. She is judged by spectators' memory, not by her own data.

Men's volleyball shares the condition, somewhat more severely, because the audience is smaller and the pressure to publish is correspondingly lower. A league without a digital audience has no commercial incentive to make its numbers transparent. That loop feeds itself.

The setter suffers most in this picture. The quality of a set depends on distance to the net, ball speed, and whether the attacker has to adjust her steps. None of those three are recorded in the domestic league. The result is that a good setter and a lucky setter look identical on the stat sheet.

The counter-intuitive angle: more numbers is not automatically better

The natural response to this piece is: then publish more data. I do not believe that is the answer.

The worst volleyball analysis I have read tends not to be the work with no numbers. It is the work with a great many numbers, copied from a source nobody verified, delivered in the tone of a verdict.

For six months I tried a small exercise: every time I read a domestic volleyball piece citing figures, I logged the source. Of 41 articles, only nine stated where the metric came from. Of those nine, four cited an aggregator that did not link back to the original. In the rest, the number appeared with no root at all.

The Kenji Nakamura investigation did more than cost me sleep. It made me ask what I had believed in. During three months of verification, the frightening part was how quickly I nearly believed a story that had been told too smoothly.

Vietnamese volleyball is at exactly the point where a smooth story can form very fast. The team is rising, the audience is growing, and demand for content is outpacing demand for verification. In that state, a good-looking stat sheet carries more weight than an accurate one.

Which is why that nine-page report of empty cells, useless as it is professionally, is more honest than much of what I read that same week. It said it did not know. Very few pieces dare say that.

Before building a large data system, Vietnamese volleyball needs a shared convention on what a metric means, who records it, and under what conditions. Without that convention, more numbers only produce more useless argument.

There is a practical reason this matters more than its academic appearance suggests. When official data does not exist, the market generates substitute data — and those substitutes usually serve purposes other than understanding the match. Data transparency is the first barrier against information distorted by outside interests.

There is a small paradox here: the professionals in the country know this better than anyone. Assistant coaches keep thorough records, but those reports never leave the meeting room. The gap is not in collection capability; it is in the habit of sharing.

What remains after each set

Mizuki Imai's tears in Tokyo were not about defeat. They were about four years nobody saw. I think of that whenever a Vietnamese player is judged solely by the points she scored in one match.

Behind every missing metric is a morning training session nobody filmed. A shoulder injury never written into a report. A change of footwork nobody noticed, which is the entire difference between a blocked spike and a point.

The technology to record volleyball data is far cheaper now than a decade ago. A domestic league could log rallies, reception positions and attack efficiency by zone with two fixed cameras and one trained input operator. Cost is no longer the biggest barrier. The biggest barrier is the habit of accepting storytelling without verification.

Some mornings I ask myself: am I writing about sport, or about people running from themselves?

I still keep that nine-page report. I keep it as a reminder: when there is no data, the only way to preserve professional dignity is to say plainly that there is no data. And once there is data, the next obligation is to say where it came from.

If I had to choose one task to do first, I would choose publishing one complete season of data, in full, uncut — so that at least the next generation of players has a baseline to grow from.

Vietnamese volleyball is entering a period in which every match deserves to be recorded more fully. The first task, perhaps, is to open an empty cell and fill it with an agreed definition — before filling it with a story.