An Empty Spreadsheet and the Analyst's Discipline to Say “Not Enough”

At 1:47 in the morning, an Excel file arrived at my data café from a table tennis team in Saigon. The first column was filled in: “Sport: table tennis.” From the second column onward, blank — no athlete names, no scores, no match date, not a single serve recorded. I looked at that file for exactly eleven minutes, the length of one game under the current rules, then shut the laptop. Twelve years ago I would have filled that blank with guesswork. In 2026, while working as a data consultant for a V.League club, I read a viral post claiming my team won through “fighting spirit.” My numbers showed the opponent's PPDA was just 8.2 — they had deliberately dropped their press to counter-attack; it was not that we were better. I wrote 1,500 words citing an xG total 4.7 goals below the actual goal count. The piece travelled widely, and I learned something: emotion is free, but evidence is paid for in hours. Table tennis is a different story. There, even the minimum evidence usually does not exist. At most domestic table tennis events in Vietnam, from district level to national level, the only thing recorded is the score of each game. Three games, four games, who won. The match sheet ends there. Nobody logs the serve sequence, nobody counts the win rate on the third-ball attack, nobody measures the average rally length. A table tennis match can contain more than two hundred points, and we preserve exactly one line. The gap between international and domestic data is not a technology gap. The WTT ranking system publishes openly and updates on a rolling 52-week cycle — points earned at an event expire after exactly one year. A ranking is therefore not a verdict; it is a snapshot of a year sliding away. A player ranked 12th may be carrying nearly nine hundred points that expire within three weeks. A player ranked 30th may be debt-free on points and walking to the table much lighter. The ranking tells you where someone stands; it does not tell you whether they are strong or shaking. To see who is shaking, you need the date. You need the name. You need the event. That is why the blank spreadsheet kept me awake, not because it was embarrassing. It is unanalysable. Without a player's name there is no head-to-head record, no insight of the kind where one player has never beaten another across five meetings — the sort of detail the eye skips and the table catches instantly. Without a date you do not know which points are expiring, which phase of the Olympic cycle you are in, or which tier the event sits at. Without game-by-game scores you do not know whether a player won on the strength of the serve or because the opponent self-destructed at the decisive points. My trade splits a table tennis analysis into nine layers. It sounds like a lot, but every layer answers one very ordinary question: what is actually happening. The first layer is technique and tactics — playing style, serve structure, how the return is handled. The second is player data and head-to-head history. The third is the event system and points rules. The next four are the competitive landscape, rules and governance, the coaching staff, and the risk surface. The last two are the public narrative and how it transmits into the market. Each layer needs a different raw material, and all of them need one thing in common: a timestamp. The competitive landscape is the clearest example. Men's singles, women's singles, men's doubles, women's doubles, mixed doubles and the team event have entirely different degrees of openness. Men's singles is usually tighter, with a narrower margin for error; a player half a beat off form is gone in the early rounds. Men's doubles depends so heavily on pair structure that one change of partner can collapse an entire plan. If you do not know which event line is being discussed, every judgement is hot air. And yet most table tennis arguments on Vietnamese social media collapse all of it into a single word: “table tennis.” I once spent a whole month reviewing footage after mispronouncing the name of a Russian striker three times in the first half of a major match. The shame was the shame, but that review gave me something the scoreboard never does: the space behind a full-back at a team that reached the final rounds. Old footage is a mirror, and only those who dare look into it see themselves. That mirror points straight at table tennis analysis: if nobody records the serve, we will keep discussing table tennis by feel. The history of this sport is the history of rule changes that reshaped a whole generation of playing styles. The ball went from 38mm to 40mm. Scoring went from 21 down to 11. The hidden-serve rule arrived. Speed glue was banned. Then the ball moved from celluloid to plastic. Each time, some players lost careers and others were born. Proving that with numbers requires someone to have recorded the moment before and after. With only scores, every analysis stops at “things were different back then” — a sentence that kills every argument. Risk works the same way. A wrist injury in a player who specialises in heavy spin serves is not the same as a knee injury in a player who lives on movement. Three consecutive weeks of low-tier events is not the same as three weeks at the top tier. But to say that, you need injury data, a competition calendar and a physical profile. Those three sit in three different drawers and nobody ties them together. Market transmission follows a similar path. A player rises and demand follows for blades, rubbers, glue, and even coaching classes in the big cities. To measure that spillover — what share of new students arrived because they watched one specific match — you have to place sales data, enrolment data and media data side by side. Those three sources have never met in the same sheet. The majority in this industry responds to a blank by filling it. An empty data file becomes a full commentary piece within two hours, because people need content, not truth. “Class,” “character,” “spirit” — three keywords that can replace any missing statistics table. I understand the pull. I once wrote that way and I was once praised for it. The reverse view is harder to hear: the people who complain loudest about missing data are usually the ones who never recorded any. A coaching staff demands numbers to evaluate players, yet nobody fills in the morning training sheet. No analytics system is born out of goodwill. It is born out of one person who stays behind after training, opens the notebook, and writes the first line while the team bus has already started its engine. Numbers know how to hold their breath, and I wait for them to exhale. But some numbers never exhale, because nobody ever put them on paper. Every number is a piece of the puzzle, but I do not assemble them out of habit. The industry's habit is to assemble by outcome: whoever wins has every metric looking beautiful. That method produces conclusions that are emotionally unobjectionable and technically useless. The crowd watches the score; I watch the pass that was forgotten — and in table tennis, the forgotten pass is the second serve at 9-9. By the same logic, I do not trust a pretty conclusion if it has no source. Based on my experience tracking matches, before using any figure I ask three questions: where did this number come from, when was it recorded, and what reason did the recorder have to record it wrongly. Those three questions filter out most of what drifts across the internet. What remains, however little, is enough to build a judgement on. What I want to see in the next round is not a title. I want to see one district-level tournament commit to recording three things across an entire season: who served, how they served, and how that point ended. Three columns. One season. If that happens, twenty years from now my students will have something I never had: a real mirror to look into, instead of a blank spreadsheet and a morning spent guessing. My data café is busiest when the arena is empty. But if the arena is empty and the books are blank too, then a full house is only people telling each other stories.