Cold Numbers: Why Long An and Nguyen Trong Hung Are Lessons for Vietnamese Sports

In 2026, Long An FC were leading the V-League after 12 rounds with 13 goals. The sports press unanimously praised their unbeaten run, calling them a 'phenomenon' of the season. But from a small office in Nha Trang, I looked at the Excel spreadsheet I had built from match videos, and I saw another number: their xG was only 8.6. That meant they had scored 4.4 goals more than expected – a gap too large to be sustainable. I wrote a blog called 'Cold Numbers', warning that Long An would be relegated when luck regressed to the mean. Commentators called me heartless, but I didn't care. By the end of the season, Long An finished bottom with 18 points. The data had spoken, and it never lies. This incident is not just a story about a relegated team. It shows the gap between how Vietnamese sports media evaluate performance and what actually happens on the pitch. While everyone looked at the league table, I looked at the xG curve, the number of shots, the quality of chances – things that reflect true level. My method is not sophisticated: I rewatched videos, classified each situation into clear chances and half-chances, then calculated average scoring probability. That is what I have done since 2026, before COVID devastated everything, and I have continued until today. The second story comes from 2026, when stadiums were closed worldwide. While other journalists waited, I built a database of five V-League seasons, tracking 240 players with metrics on acceleration and distance covered. I discovered that Nguyen Trong Hung of CLB Sai Gon, although still scoring, had seen his acceleration drop by 38% compared to the previous season. He was slowing down, and that cannot be seen with the naked eye. I posted a warning on my fan page, recommending the club not to extend his contract. The club leader angrily replied: 'Don't sit in Nha Trang and talk about the pitch.' When football resumed, Hung moved to Binh Duong, played only 11 matches, and lost his starting spot. Once again, the data was right. The lesson from these two cases is not limited to football. It applies to swimming, athletics, or any sport in Vietnam. We are lagging behind the world in data analytics. While European clubs use GPS to track every step, our swimmers still train by feel. When a swimmer breaks a national record, the press celebrates, but no one asks: is the arm stroke efficient? Are the kicks optimal? Compared to international rivals, what is the energy expenditure? Sadly, these questions barely exist in the boardrooms of sports federations. Many may argue that sport is about emotion, mentality, and sacred moments that cannot be quantified. They say data cannot explain why a player scored in the 90th minute, or why a swimmer won by a fingertip. But that is the trap. When I analyzed the 2026 World Cup, I saw that Germany lost to South Korea because they ran too little: their PPDA was 13.2, meaning they allowed the opponent more than 13 passes before pressing. In that match, the German forwards only ran 6.3 km – not enough pressure. It was not South Korea's magic, but laziness in movement. The data had shown it since the group stage, but no one believed. People prefer stories about 'German spirit' over dull numbers. So what should we do? I suggest that Vietnamese clubs and sports federations start building their own databases. No need for huge investment, just a few passionate people watching videos and recording every situation. Calculate xG for each match, track players' distance, acceleration, and consistency over time. These numbers will help you see clearly which player is declining, which team is getting lucky, and which tactic truly works. Long An paid the price for not listening to data. Nguyen Trong Hung paid the price because his former club did not believe in actual speed. The question is: when will the wave of data analytics reach Vietnam? We can continue to live in illusion or accept the truth from numbers. I have chosen the second path, and I believe it is the only path to sustainable development.