When the Dataset Is Empty: What a Football Analyst Does Before a Match With No Numbers

Eleven at night at a coffee shop on Nguyen Chi Thanh Street, Da Nang. I open my laptop, the analysis file appears, and inside there is nothing but empty cells. No passing data, no heat map, not a single line of notes on the starting eleven. Seven years ago I sat in this very spot, recording every transition of Hanoi FC across twelve matches, until I found that thirty-seven percent of their goals came from counterattacks lasting no more than eight seconds. Tonight, the screen says nothing.

An outsider often assumes the job of a commentator is to talk. Most of the time, I sit still. The ball is dead on the pitch, but intent lives in every metre of movement. Before the ball rolls, all I have is space — and space, if it is not filled with observation, will automatically be filled with guesswork. That is the most dangerous moment in this profession.

I have worked in this trade since 2026, when I graduated from the Journalism Academy and joined Bong Da newspaper, while also writing for The World of Sports from Madrid. More than forty years later, I still keep one habit: before asserting anything, I check it three times from three different angles. People call that caution. I call it the minimum condition for being allowed to speak.

In 2026, at fifty-eight, I rewatched twelve matches of Hanoi FC and wrote a four-thousand-word analysis, with a 5-3-2 diagram when out of possession and a 3-4-3 when in possession. The piece pointed out that their back line pushed high without cover, and coach Chu Dinh Nghiem himself later admitted the gap. What I learned was not in the conclusion but in how I reached it: I counted every phase, recorded every second, drew every arrow. Without data, I have no article.

In 2026, at fifty-nine, I worked as a guest commentator for a Da Nang radio station during the Belgium–Japan round-of-16 match. Before kick-off, I watched five matches of each side and noticed Roberto Martinez often left Marouane Fellaini and Nacer Chadli on the bench. I said on air that if they fell behind, Belgium would bring those two on to break Japan's high press. The match unfolded exactly to script: Japan led by two, Martinez made his changes in the sixty-fifth and seventy-fourth minutes, Belgium won three-two. The Japanese taught me patience; the Belgians taught me ruthlessness. But both lessons began with something very dry: watching enough matches before speaking.

In 2026, when world football froze because of the pandemic, I was sixty-one, with four months and no match to comment on. I downloaded two hundred matches from the V-League and the First Division of the 2026 season, counted every counterattack myself, noted the ball's starting position, the number of passes and the time to completion. The result was a spreadsheet of five thousand rows, with an index I named myself: the useful-space index — measuring the area of the pitch an attacking side occupies in the first three seconds after winning the ball. When football returned in September, I used that index and stated precisely why SLNA lost from a winning position in the ninetieth minute.

Tonight, the dataset is empty. And I am forced to answer something this profession rarely dares to ask: when there is nothing to analyse, what should an analyst do?

There are three choices. One is to write. Two is to wait. Three is to admit that I do not yet know.

The first choice is the most seductive and the most harmful. I have watched many colleagues, short of data, immediately fill the gap with beautiful words: wonder goals, legends, character. Those words are not grammatically wrong, but they say nothing. An article without data is like a tactics board without arrows: balanced, tidy, and useless.

I learned this from my own mistakes. In 2026, when I had just begun systematic note-taking, I rushed a conclusion about a counterattack after watching only one clip. A colleague sent me another camera angle. The same situation, but the player I thought was receiving the ball was in fact only dragging a defender. My conclusion collapsed in thirty seconds. Since then I set my own rule: one clip is not enough, one source is not enough.

Facing an empty dataset, the third choice — admitting I do not know — is the most honest. It is also the most easily misunderstood. Audiences do not pay to hear someone say "I don't know." They pay to hear someone say something.

This is where I must separate two things easily confused: honesty and silence. Honesty does not mean sitting still. Honesty means stating clearly where I stand, and what could make me stand wrong.

If tonight I had to write about a match for which I lacked sufficient data, I would begin by stating clearly what I am missing. I would not pretend to have watched twelve matches if in fact I had watched three. I would not draw a 5-3-2 out-of-possession diagram if I had not identified who provides cover. I would say: this is what I see, this is what I do not see, and this is what would change my mind.

A formation says nothing until the ball is lost. A formation on paper is a list. Only when the ball leaves a player's foot and no one knows where it will go does that formation begin to tell a story. Before the ball rolls, every analysis is a hypothesis. And a hypothesis without data behind it is only a belief written carefully.

My trade is not to offer beliefs. My trade is to turn beliefs into something verifiable, or to discard them.

The counter-intuitive point lies here: an empty dataset still carries information.

When an analysis file contains nothing, it means someone — a reporter, an analyst, a system — collected nothing. The question to ask is not "what shall I invent to fill the gap," but "why does the gap exist." Perhaps the match has not been played. Perhaps the collector has not done the work. Perhaps the data was lost. Each possibility leads to a different response.

The Japanese taught me that emptiness can be a designed state, not a fault. The Belgians taught me that sometimes one must act amid uncertainty. Between those two lessons, I choose a third way: act, but state clearly the degree of my uncertainty.

I am sixty-seven. I have seen too many analyses written only to fill a gap, and too few that dare to leave the gap standing. When the pitch is empty, I find the counterattack inside my own head. But even inside my head, I still have to know where I am running.

If the next match is played and I still lack sufficient data, I will write less, not more. I will choose a single detail verifiable by eye — a run, a gap, a substitution — and speak about it to the end.

The strong attack with the ball; the clever attack with space. And the writer, I think, attacks with honesty about what he does not yet know.