Empty Stands in Tokyo and the Home-Advantage Test in Swimming

On 31 July 2026, in lane 4 of the men's 100m butterfly final at the Tokyo Aquatics Centre, Caeleb Dressel touched the wall. The scoreboard flashed 49.45 seconds, a new world record. Above him, nearly 15,000 seats sat empty. No cheers, no applause, only the sound of water against the pool edge. In nearly a century of the modern Olympic Games, a world record has rarely been set before such a silent stand. I rewound that clip three times, not to study the start, but to hear how dense the silence was.

My writing career began at a domestic newsroom, where I was assigned to cover swimming meets and learned to record every lane, every turn, every touch. Years later, when I moved into sports data analysis, I understood why swimming is the cleanest sport in terms of numbers: the result is decided by an electronic clock, not by a referee who can be swayed by the crowd.

In the summer of 2026, when the pandemic halted European football, I had a rare natural experiment in my hands. The Bundesliga returned in May with empty stadiums. I compared nine previous seasons of data with 93 matches played in silence. Home win rate fell from 41.3% to 34.7%; average goals per match dropped from 3.1 to 2.7. I wrote a 20-page study, delayed it two months because I wanted a more complete model, then published it in an academic journal. When an editor says no, I learn to listen to the data, and this time the data said the hypothesis needed testing in another sport.

Tokyo 2026 was that test. The Games ran from 23 July to 8 August 2026 under a COVID-19 state of emergency. Nearly every venue was closed to spectators, including the pool at the Tokyo Aquatics Centre. Based on my experience tracking matches, I sat in front of the screen, logging every split, every record, to see whether my hypothesis still held once I left the pitch.

The result lies where few looked. In a completely empty arena, swimming at Tokyo 2026 still produced a string of world records, evidence that home advantage in a time-based sport operates through an entirely different mechanism than in football.

The list of Tokyo world records is long enough to break the assumption that a crowd is mandatory fuel for peak performance. Caeleb Dressel broke the men's 100m butterfly world record in 49.45 seconds, and set Olympic records in the 50m freestyle (21.07) and 100m freestyle (47.02), taking five golds. South Africa's Tatjana Schoenmaker broke the women's 200m breaststroke world record in 2:18.95. Australia's women's 4x100m freestyle relay set a world record of 3:29.69; China's women's 4x200m freestyle relay set a world record of 7:40.33; and Great Britain's mixed 4x100m relay set a world record in an event making its Olympic debut.

In individual lanes, Emma McKeon collected seven medals, the most ever won by a female swimmer at a single Games. Katie Ledecky won the 800m freestyle and the women's 1500m freestyle, contested at the Olympics for the first time. Adam Peaty defended his 100m breaststroke title in 57.37, becoming the first British man to do so in swimming. Those numbers appeared in a pool without a single fan.

The same holds at the micro level. Start reaction times at Tokyo hovered around the levels common at previous Games, typically 0.60 to 0.70 seconds in the short events. If crowd noise were a catalyst for reflexes, we would expect delays to rise across the board in silence. I did not observe that in the published data.

In the relays, where teamwork and collective emotion matter most, lane quality did not collapse either. Teams still broke records, still hit season's bests. If the crowd were an irreplaceable source of energy, relays should have been the first to decline. The opposite happened.

I do not argue with emotion; I present a chain of data. The Tokyo data shows peak performance does not depend on cheering. To understand why, we need to separate two mechanisms of home advantage.

In football, home advantage flows mainly through the referee channel. My 2026 study showed that when stands are empty, fouls awarded to the home team fall, and home win rate falls with them. That is a psychological effect on the decision-maker, not on the game itself. Fans do not score goals; they act on the person who records them.

In swimming, the decision-maker is the clock. There is no penalty dispute, no stoppage time, no clear chance denied. Swimming is a pure time trial: touch first, win. The main channel of crowd influence is cut off from the start. A crowd can ignite an athlete, but it cannot turn one hundredth of a second into another hundredth on the board.

I still remember watching the Tokyo splits. In the women's 1500m freestyle, Ledecky swam with an almost mechanical rhythm, each 100m varying within a very narrow band, the kind of pacing I have seen in athletes who train in a quiet environment. In Schoenmaker's 200m breaststroke, the back half was faster than the front, the mark of a race controlled by an internal stopwatch rather than by crowd emotion.

For a point of comparison, Rio 2026 took place before packed stands and also saw many world records, some of which stood for years, such as Katie Ledecky's 400m and 800m freestyle marks. Both Games, with and without crowds, produced peak performances. The difference lies in other variables: training cycles, athlete generations, pool conditions.

This is where I must be most careful, because correlation is not causation. That records still appeared in an empty pool does not prove the crowd is meaningless. It only proves the crowd has never been a necessary condition for peak performance. Those are two different propositions, and mixing them is the most common analytical error I encounter.

If a crowd matters in swimming, it must travel through much narrower channels than in football. A large crowd can affect officials' decisions: false starts, breaststroke technique, butterfly technique, underwater turns. In swimming, officials do not decide who wins, but they can disqualify a swimmer. Loud noise from the stands can mask the start signal, or create pressure that makes a swimmer commit a technical fault at a crucial moment. That is the only channel through which empty stands can truly change a result, and it is far smaller than the referee channel in football.

The trap is that many analysts took the Bundesliga's 41.3% to 34.7% figure and extended it to every sport. They assumed empty stands would crush performance everywhere. The real variable is not crowd size; the variable is the mechanism through which crowd size acts. When that mechanism disappears, as in a time-based sport, the effect disappears with it. Tokyo 2026 shows that extending a correlation too far leads to the wrong conclusion.

Conversely, empty stands are not necessarily a disadvantage. Some swimmers admitted that a quiet pool helped them focus more, less distracted by noise, controlling their breathing better. I have no quantitative data for that subjective feeling, so I do not write it as a conclusion. But it explains why a list of records could appear under conditions that seemed the most unfavourable.

On data limitations, I must be clear: comparisons across Olympic Games carry many error terms. Pool conditions, depth, water temperature, schedule and even athlete generations all change. That one edition produces more records than another may reflect a training cycle rather than the presence of a crowd. That is why I use Tokyo as a single data point, not absolute proof.

Amid the noisy stands, I choose to sit with the numbers. The Tokyo numbers tell me swimming is almost immune to the empty-stand effect, because its result does not pass through people. The stadium is empty, but the numbers still know how to score.

Looking ahead, Paris 2026 brought crowds back to the pools, and Los Angeles 2028 will have full stands. For me, the data worth tracking is not the count of world records, but the gap between a swimmer's season's best and their performance at a home Games. If home advantage exists in swimming, it will surface most clearly in the relays, where a host team can be lifted by its own crowd. That is the first feasible test since the pandemic.

Every transfer is a problem waiting for a solution, and so is every swimming record. Unlike transfers, though, a swimming record does not sit in a closed meeting room; it sits on the scoreboard, in the open, hundredth by hundredth. For a data journalist, that is a rare gift: a sport where the truth cannot be bent by public opinion.