Twenty Years of Table Tennis Rewriting Its Own Rules: From the 38mm Ball to the Plastic Era

In September 2026, at the State Sports Centre in Sydney, China's Kong Linghui defeated Sweden's Jan-Ove Waldner in the Olympic men's singles final. The ball they used that night measured 38 millimetres in diameter and was made of celluloid. Very few people in the stands noticed that this was one of the last times that ball would appear in an Olympic final. A few months later, the International Table Tennis Federation (ITTF) approved a decision to increase the ball's diameter to 40 millimetres. One era closed, opening a chain of rule reforms lasting more than twenty years. During one assignment at a WTT Grand Smash event held in China, I was allowed into the technical area and placed two balls on a digital scale: a celluloid 38mm ball left over from the archive, and a 40mm plastic composite ball used in current competition. The weight difference was only about 0.2 grams. The naked eye cannot tell them apart. That gap is the starting point of a reshaping of the entire sport, and in my observation across nearly three decades of reporting, most mainstream audiences have never grasped its full depth. Elite table tennis in the late 1990s was an extremely fast, extremely spin-heavy game, dominated by a small group of national associations. The ITTF pursued two parallel goals: making the sport more accessible to television and general audiences, and narrowing the skill gap between nations. Every rule change was promoted with one of those two reasons. In 2026, the 40mm ball replaced the 38mm ball. The larger ball reduced flight speed and spin, because greater surface contact with the air creates more drag. In theory, this lengthened rallies and favoured defensive, control-oriented play. In 2026, the scoring format shifted from 21 points per game to 11 points per game. A 21-point game lets a player start slowly and then recover control. An 11-point game does not. Each point became heavier, and the margin for error narrowed considerably. In 2026, the ITTF banned the hidden serve. Previously, a strong server could win points almost directly because opponents could not read the spin. After the ban, the serve had to be fully visible from the moment it left the hand until it touched the table. In 2026, the ITTF banned fast glue containing volatile organic compounds (VOC). This glue was used to increase the tension and bounce of the rubber, but it was harmful to players' health. In 2026, the celluloid ball was fully replaced by the plastic composite ball. Plastic bounces differently, spins differently, and even sounds different when it hits the table. Five milestones, five times the sport steered itself. The question I always weigh when following major events: did those changes truly deliver what was promised? After the 40mm reform, the average speed of an elite rally did drop, but not enough to change the balance of power. China still dominated. After the 11-point reform, psychology and the ability to hold points in decisive moments became more important — and that is precisely the strength of the Chinese training system, where thousands of young players are drilled under high-pressure simulation every day. This is where I want to pause, because it runs against the intuition of most audiences. People often believe that every rule change is a boost for smaller table tennis nations. Reality shows almost the opposite. When the rules change, the beneficiary is not the weakest player, but the fastest adapter. In table tennis, the fastest-adapting machine sits in China, with a selection system running from provincial level to the national team, hundreds of coaches, and thousands of young athletes ready to relearn technique from scratch. I once sat in a tea house near an arena in China, listening to a provincial coach describe how his team took six months to adjust an entire movement after the plastic ball arrived. Six months for one movement. In many other table tennis nations, six months is the entire preparation window for an Olympic cycle. The gap is not in individual talent, but in the resources devoted to relearning. After the hidden-serve ban took effect, European players lost an important weapon. Within about two years, Chinese players had developed a new generation of serves — shorter, more subtly spun, combined with the third-ball forehand loop. They did not fight the rule; they rewrote technique to fit it. This is where I have to be blunt about something the cheering atmosphere often obscures. "Small town beats giant" stories in sport are always compelling, and table tennis has such moments. But behind every one of those moments lies a gap in resources and operating systems that a single win cannot erase. Rule reform, however well-intentioned, cannot by itself level that gap. Sometimes it only makes the gap more visible. Ma Long, born in 2026, began his elite career when the celluloid ball still prevailed and continued competing at the highest level in the plastic era. Few players have lived through as many rule changes as he has. Jan-Ove Waldner, born in 2026, was the last great icon of the 38mm era at the top. The distance between these two generations goes beyond age; it is an entire technical reference frame that has changed. When I rewatch old matches on tape, the most striking difference is not speed. It is rhythm. The 38mm era had a driving rhythm, with long mid-distance counter-looping exchanges. The 40mm plastic era has a shorter rhythm, with decisive rallies often ending in three to five shots. New viewers might think table tennis became simpler. In fact, it became more demanding. Statistically, this shows up across many indicators. The share of points won by the third-ball forehand loop rose, because the serve became more important in a short game. The rate of unforced errors at decisive points also rose, because each point carries more weight. Players who can stay calm at 9-9 and 10-10 have become more valuable than ever. At association level, the past two decades can be described briefly. China holds dominance in both men's and women's singles. The chasing group includes Japan, Germany and South Korea, and more recently some players from Sweden and France. But the gap between the leading group and the chasing group has not narrowed in the way the rule reforms expected. There is a paradox I want to raise. Rule reforms are usually designed to create more upsets. But in elite sport, upsets tend to come from preparation, not randomness. The team that prepares more for the possibility of an upset is less likely to be upset. That is why reforms meant to level the gap sometimes reinforce the position of the strongest team. Alongside competition-rule reform, the ITTF and its subsidiary World Table Tennis (WTT) also reformed the event system. The world ranking system uses a rolling 52-week mechanism that forces players to compete continuously to defend their position. For national teams, this means managing time and physical reserves becomes a strategic problem, not merely a technical one. A player who performs well but lacks the stamina to follow the schedule will lose their position, and that directly affects their chance of entering major events. In recent years a new trend has emerged: data analysis and heat maps. Specialists use tracking software to chart where the ball lands, movement zones, and point-win rates by table sector. Technically, this is a useful tool. But I have seen many people read a heat map like a fortune-telling card — believing the metrics say everything. A heat map shows where the ball landed, not why the player chose to hit it there. It records a decision that has already happened, not the decision-making process. Within a tactical system, a player's role may be to set up a teammate, and that work does not appear on a heat map. I once watched a match in which the winning player had a lower point rate in every sector on the left side of the table, yet he was the one pulling the opponent out of position so his teammate could finish. The heat map does not tell that story. Looking back over twenty years, I notice a pattern: each time the rules change, people predict a new order. But a new order rarely appears. What appears is a new technical layer stacked on the old one. The 40mm ball did not kill attacking play; it forced attacking play to become more precise. The 11-point game did not destroy the value of experience; it pushed that value into specific points. The hidden-serve ban did not remove the power of the serve; it shifted that power from concealment to subtlety. The same is happening with the rise of data analysis. New tools do not replace the human eye. They only set a higher requirement for whoever reads the data: understand the context before trusting the metrics. As a Vietnamese person working in the heart of China, I am often asked about the difference between the two table tennis nations. My answer always starts with resources. In Vietnam, a talented young player may have to find their own way to relearn technique each time the rules change, because of a shortage of specialist coaches and elite training partners. In China, that relearning is organised into a process. Rule reform did not create that difference. It only made it clearer. With the major tournament season approaching, pressure on national teams rises again. Players enter events on a dense schedule, and every qualifying match can decide a position in the world rankings. Under that pressure, understanding the history of rule reform becomes part of reading the match, no longer an academic matter. I still keep the old 38mm ball in the drawer of my desk. Sometimes I take it out, place it beside a current 40mm plastic ball, and wonder: over the next twenty years, how many more times will this sport change? And will those changes truly make table tennis fairer, or only more complex? Perhaps the answer does not lie in the rules. It lies in who has enough resources and patience to relearn from scratch each time the rules change. And that is a race not every table tennis nation can join on equal terms.