Distance Covered Doesn't Tell the Whole Story: The Data Gap in Vietnamese Football

At Chi Lang Stadium, after the final whistle, I stayed behind the technical area. A substitute who had not played a single minute all night was still standing there, jacket in hand, watching his teammates walk a lap to salute the crowd. A few steps away, a fitness coach printed an A4 sheet from the position-tracking software. The sheet carried a string of numbers about distance covered and sprint counts. I looked at both things at once and saw that they were telling two different stories about the same match. One side was metres measured by satellite. The other side was something with no unit of measurement at all. When I first started writing about Vietnamese football, the only things recorded systematically at most grounds were the scoreline, the cards and the list of goalscorers. Everything else lived inside the coach's head, in the team doctor's notebook, and in the memory of the people sitting in the stands. Nearly thirty years later, the outward form has changed enormously. But based on my experience of watching matches here, the pace of change has not been the same everywhere. At national-team level, a data analysis department has become almost mandatory. Vietnam's matches in the 2026 World Cup qualifiers were the first time I saw so much data brought to a press briefing, from the kilometre count of each line to the heat maps of where the back four stood. That was a genuine step forward. But it also created an illusion that the entire game here is measuring everything. At club level, the gap is far wider. A handful of teams have their own analysis room, with someone coding the match ball by ball. Many others still rely on raw data pushed out by a service provider after the game, read once and then filed away in a drawer. V.League 1 runs with 14 clubs for most of the season, and no two of them share the same measurement standard. The same metric can mean two different things at two different clubs. One difficulty that rarely gets mentioned is the source of the data. Most V.League 1 clubs buy their service from a small number of providers, and each provider defines its metrics in its own way. When two teams meet, the home team's sheet and the away team's sheet can disagree on the very same passage of play. Nobody is technically wrong, but nobody can cross-check either. VAR arrived in V.League 1 from the 2026 season and brought a new kind of data: passages of play that get reviewed. But VAR does not produce analytical data. It produces verdicts. And a verdict, right or wrong, lodges itself in the crowd's memory faster than any spreadsheet. Spectators remember goals; I remember the eyes of a substitute when the whistle goes. That is why I always read the statistics sheet last, never first. Distance covered is the most misleading metric in modern football. It is presented as a measure of effort, and most viewers read it that way. A midfielder covering 11.4 kilometres sounds like a hard-working midfielder. But if three of those kilometres are walking back into position while the ball is on the other side of the pitch, then that number says very little about his value. Meanwhile, a centre-back covering 8.2 kilometres with seven well-timed coverages can be the man who decides the match. The problem is that no statistics sheet has a column marked "wasted running". It only records the total. And a total is always morally neutral: a player who runs a lot because his team is weak and has to chase the ball will post prettier numbers than a player who runs little because his team holds 65 per cent of possession. That paradox has never once been explained on a broadcast. Sprint counts come closer to the truth. They measure the moments when a player pushes his body near its ceiling. But they do not measure direction, they do not measure timing, and they do not measure whether the player managed to see the pass in time. A sprint in the wrong direction, half a metre faster than a sprint in the right direction, is logged exactly the same. Gegenpressing is not a strange new wind; it is a wind that has been fermenting through quiet seasons of running. In Vietnam, the closest thing to pressing I have ever seen in youth teams did not come from an imported coaching manual, but from a group of players training together long enough to guess each other's next step. That is data that exists in no export file. Another metric is being mentioned more and more: PPDA, the number of passes the opposition is allowed before your team makes a defensive action. It sounds highly technical, but the principle is simple: the team that lets the opponent make fewer passes before closing down is pressing higher. The problem is that in V.League, PPDA can look flattering for false reasons if the back line deliberately drops deep and lets the opponent pass sideways in harmless areas. That team presses low and still takes the points. So when I read a post-match sheet, I always ask myself three things. What device measured this metric, under what conditions, and to answer what question. If I cannot answer all three, I leave it and go back to what I saw with my own eyes. The measurement conditions in Vietnam also create their own distortions. High heat and humidity mean the same running load costs far more energy than in a European winter match. Uneven pitches from one ground to the next change both running speed and sprint counts. A striker running on a soft northern pitch in March will post different numbers from the same striker on a hard southern pitch in June. Back in 2026, when the leagues stopped, I was in Da Nang working on a feature about SHB Da Nang during the empty days at Chi Lang. Mr Le Huynh Duc phoned and asked me to help record the diaries of eleven young players stranded in the training camp. I sat in the corridor of the training ground from six in the morning, never interrupting, never pushing. What I recorded contained no metrics at all. An empty stadium does not stop the ball rolling; it only makes the applause arrive one beat behind the heart. That season taught me that most data only becomes meaningful when someone is sitting beside the player to ask the right question at the right moment. Two years earlier, in a Russia 2026 so cold that I remembered every breath of the stands for four years afterwards, I followed the Vietnam U23 team through their training camp ahead of the tournament. After a friendly defeat to Lokomotiv Moscow, 1-3, goalkeeper Bui Tien Dung, barely into his twenties at the time, sat in a corner of the training pitch. He said nothing. He packed away his gloves himself and wiped down his goal. No metric records that act, but it told me more than a whole page of reporting. I keep the rhythm of a team not with a drum, but by never missing a single training session in thirty years. That is how I learned to tell two kinds of numbers apart: those born from behaviour on the pitch, and those born to fill a gap in a report. There are three things a statistics sheet almost never captures. The first is timing. A pass played half a second late is not logged as an error, but it turns a scoring chance into a clearance. The next is relative position to teammates: the player who stands in exactly the right place to open up space is not credited, while the man who receives the ball afterwards is. The last is intent. A failed piece of skill that nonetheless matched the coaching staff's tactical idea will never appear on a scorecard. Let me be clear: I am not against data. My trade has changed for the better because of it. I am against using data as an ornament in a press room, when nobody in the room can explain the conditions under which a metric was produced, or what question it was meant to answer. What is striking is that domestic coaches usually read numbers far more carefully than the public imagines. In a conversation with a V.League coach, he pointed at a metric and asked me whether I knew how long it had taken that player to cover that distance. I could not answer. He smiled and said that without knowing that, the number was meaningless. That is the clearest answer to why Vietnamese football still needs more people holding notebooks than holding laptops. Most of the misunderstanding comes from outside. Many foreign colleagues, looking at Vietnamese football, still assume that a lack of data means a lack of professionalism. I have argued this point many times and I stand by my view: professionalism is not the number of files, it is whether people are honest about what they actually observe. Another misunderstanding comes from within. For a period, getting a handful of metrics onto the big screen was treated as proof of modernisation. The big screen was there, but the accuracy and consistency of the data source were never checked. The result was that spectators were fed a feeling of progress rather than a tool for understanding the game. There is one more assumption I hear constantly: that foreign players and foreign experts will bring professionalism with them. My experience shows the reverse can be just as true. Some experts arrive, bring a process, and then that process dies out within two seasons because no Vietnamese staff member takes it over. What is missing is not the tool, but the habit of writing things down and cross-checking them. VAR is the clearest example of this kind of misunderstanding, running in the opposite direction. The video referee has no power to change the laws, but it does have the power to change how a match is retold. A team that concedes a penalty after a review will remember it far longer than a goal conceded from live play. The debate afterwards circles the decision, not the performance. In football, and in any sport whose rules shift from season to season, I have seen the same thing many times: when the rules change, people remember the ones who adapted, and forget that it was the change itself that selected the adapters. For me, the most interesting thing to watch over the rest of the season is not in the league table. It is in the way an academy teaches a seventeen-year-old to read his own report. If that happens, data has become a shared language rather than a privilege of the coaching staff. It is also in consistency. A club that publishes the same metric, measured the same way, across twenty rounds is worth far more than a club that throws out ten pretty metrics in a single match. And it is on the substitutes' bench. That is where people talk about the things no spreadsheet records, and sometimes those very conversations are what forecast next month's results. If there is one thing I want to leave with younger writers, it is to keep a notebook of your own for every season. Write down the date, the place, the weather, what you saw, and sometimes even what you smelled at the ground. Thirty years from now, that notebook will be the most valuable dataset you own, because no one else alive holds an identical record. A season opens with a heartbeat in the press room, before the first whistle is blown. And that heartbeat, to this day, has no device that can measure it.