Vietnamese Volleyball Is Short on Data: Analysts Still Count Every Rally by Hand

Fifth set of the Hùng Vương Cup final. The scoreboard read 13-13.

I was sitting in the press row at Lãnh Binh Thăng Arena, notebook in my left hand, pen in my right, marking every rally. After the final whistle I walked down to the technical area and asked for the full match sheet. The official handed me a single page: set scores, match duration, starting line-ups. No perfect-pass rate. No attack efficiency. No block touches. That was the entire official data set for a national final, at one of the oldest tournaments in Vietnamese volleyball.

I went back to my seat and opened the notebook again. 128 rallies. I counted every one by hand, marking each position, each setter decision, each spike that sailed long. Four hours of work for a match that, at an international event, would have been logged automatically.

Context: a strong sport with a weak record-keeping culture

Vietnamese volleyball is in its finest stretch in decades. The women's national team won the 2026 FIVB Challenger Cup in Manila with a 3-1 victory over Belgium, earning the country its first-ever berth in the 2026 Volleyball Nations League. Trần Thị Thanh Thúy, the captain born in 2026, has become the defining export of her generation, playing professionally abroad. At home, the current era boasts Nguyễn Thị Bích Tuyền, Đoàn Thị Lâm Oanh and Nguyễn Thị Kim Liên, names every fan in the country knows. The national championship, the Hùng Vương Cup, the VTV Cup and the SEA V.League run every year, and plenty of matches sell out.

Look at the record-keeping, though, and the gap is far wider than anything the scoreboard shows. FIVB and AVC have used standardised statistics systems for years; every rally at the Nations League or the AVC Challenge Cup is coded touch by touch, classified by position and outcome. At domestic tournaments, recording mostly stops at set scores and basic technical errors.

For me, that gap belongs to an entire volleyball culture. Any serious tactical argument has to start in one place: what are you measuring.

Core: four metric families, and the price of missing them

Professional volleyball analysis rests on four foundational groups of numbers. Perfect-pass rate, the share of first contacts delivered to the ideal spot so the setter can open the full attack menu. Attack efficiency, which is not points scored but points minus errors and blocked attempts, divided by total attempts. Blocks per set. And the ratio of service aces to service errors.

Without them, viewers are left with one tool: the memory of the prettiest rally. That is why a hitter with 25 points is celebrated more loudly than one with 18, even when the second player posted far better efficiency and passed better from the back row.

A more concrete example. In women's volleyball, a rotation with two attackers at the net is a structural weak point, and any coach must have an escape plan. To know whether a team handles that rotation well, an analyst has to isolate attack efficiency by rotation, from p1 through p6. Without rotation-split data, every tactical claim collapses into a feeling.

Then there is what I call out-of-system attack: the swing that follows a broken first pass, when a team loses its structure and simply feeds its strongest hitter. The out-of-system rate is the truest measure of a reception line, and it is precisely the number domestic tournaments never publish.

My own method has nothing modern about it. A thick notebook, columns divided by the six rotations, four symbols per rally: first-pass outcome, setter, destination of the ball, final result. When I am lucky enough to have match footage, I watch it three times. Once for the rhythm. Once for the seconds nobody watches, the hush before service, the way the shape of a team shifts before the ball touches anyone. And once to check my notebook against the picture and find where I got it wrong.

A dark map has no lamps, but the watchman always lights a fire.

The contrarian angle: more data does not guarantee a truer story

I do not want this to end as a plea for digitisation. Volleyball is a sport where the decisive act usually happens before the ball crosses the net. It lives in the libero's half-metre step back and to the right, in the nod between setter and middle blocker, in a player past thirty choosing to hold her ground instead of chasing a block. No camera logs those things as data.

If Vietnamese volleyball rushes into digitisation, we may end up with a great many spreadsheets and very little understanding. I have read statistics pages where the numbers were recited to viewers like an electricity bill. Volleyball does not run on electricity bills.

Winning is easy to watch; understanding the sleepless nights takes an epic.

What I am asking for

What I want does not depend on expensive software. Just a shared notebook: the federation, the coaching staffs and a few writers like me agreeing on a minimum set of symbols, then sharing the data after each round. One open index, readable by anyone, updated steadily through the season.

In volleyball, a perfect pass lasts about a second. An attack efficiency figure only means something beside hundreds of others. A whisper can become an epic, if someone believes enough to write it down. Our job is to write it down, and leave it for the next generation to read and argue over.

At fifty-five, I am still looking for maps nobody has printed yet.