Boonson runs 9.90 at ASIAD 2026: two records broken in 47 minutes

The electronic clock at the Aichi-Nagoya stadium stopped at 9.90 seconds, and the noise in the stands collapsed into a single mass of sound in which voices and loudspeakers could no longer be told apart. In the press row nobody had time to look back at the lane draw. We only had time to write down one number, and then a second number that had flashed past forty-seven minutes earlier.

The men's 100m semifinal was run late in the afternoon of 25 September. Puripol Boonson won it in 9.91, wiping out the Asian Games record of 9.92 that Su Bingtian set eight years earlier in Jakarta. At that point the stands still had time to trade remarks about a Games record falling to a twenty-year-old. Less than an hour later, in the final, he ran 9.90.

Forty-seven minutes between two records. Nothing worth writing happened in between: a walk into the call room, a change of spikes, a few sips of water, a few strides to get warm again. Forty-five minutes on the margins of the pitch, a lifetime that never grows old — a line I have carried since the years I spent writing about women's football, and tonight it held intact on a running track.

To understand why 9.90 seconds is an event, you have to look at Asia's ten-second wall. For decades the number of Asians who had run under 10 seconds could be counted on one hand, and most of them were one-off cases that came and went. Su Bingtian was the man who turned it into a standard, with 9.83 in the semifinals of the Tokyo 2026 Olympics at the age of thirty-one. That Asian record stood until the night of 25 September.

Boonson did not come out of nowhere. At these Games he became the third Thai man to win the 100m, and the first since Suchart in Bangkok in 2026 — a gap of nearly half a century. Thai athletics has fed its sprint programme from school level, and Boonson was pushed through at the right moment. He broke out at the 2026 SEA Games in Hanoi with 100m gold, aged sixteen.

For Vietnamese athletics, the 9.94 he ran at the 2026 SEA Games carries its own meaning: it closed a long-running argument that Southeast Asians could not touch the ten-second threshold. On the women's side, it has taken until the last few SEA Games for the 4x100m relay teams of Vietnam and Thailand to become regulars in the medal fight, while Vietnam's women's 100m national record still sits above eleven seconds. That gap lives in funding more than in effort.

In Vietnam we look at this story through a different experience. In the stands in Russia I heard a great many empty seats with women's names on them. Eight years later, in Japan, those seats were still in exactly the same place: in the morning, when the women's events were contested, the stands were so thin that you could hear spikes biting into the track; in the evening, when the men lined up for the 100m final, the western block was full.

How the number 9.90 was assembled is worth more analysis than the number 9.90 itself. After crossing the line, Boonson said he had been a little tense in the start phase and still felt some regret. He said it with a regret that sounded entirely real. Looking at a scoreboard, I learned how to read what is not written on it.

Based on my years of watching short sprints up close, a 100m race divides into three segments with completely different meanings: 30m of acceleration out of the blocks, 30m of transition to reach top speed, and the final 40m, where the body starts paying its debts. With Boonson, the third segment has never been the problem. The problem is the first, and he had just said so himself.

Su Bingtian's record in Tokyo 2026 carries a detail that is rarely mentioned: his opening 60m was measured at around 6.29 seconds, the fastest ever recorded for an Asian athlete. Su made up for it with a slower closing stretch — about 3.54 seconds for the last 40m — to finish in 9.83.

Boonson's picture is the reverse. An opening 60m of around 6.40 is a reasonable figure for an athlete with good reaction who is still tight in the start. If that holds, his final 40m came in around 3.50, faster than Su Bingtian's. The entire 0.07-second gap between the two men sits in the first sixty metres, not in the sprint finish.

That is good news in a very specific sense. Top speed and speed endurance are the hardest things to teach, the hardest to improve, and they usually wait until an athlete is twenty-five or twenty-six. Start mechanics and reaction are things that can be adjusted in a few months, with reaction drills and hundreds of repetitions of the movement out of the blocks. A twenty-year-old who already owns Asia's fastest closing 40m, and still owes something over the first 60m, is an athlete who has not hit his ceiling.

His trajectory bears that out. In 2026, at the World U20 Championships in Cali, he ran 10.09 in the semifinal — at the time the best ever by an U18 athlete — before finishing fourth in the final in 10.12. At the Hangzhou 2026 Asian Games he ran 10.06 in the semifinal and took silver in 10.02, though the mark was not ratified as a record because the tailwind was over the legal limit. In 2026 he made his Olympic debut in Paris, clearing the heats in 10.13 before going out in the semifinals in 10.14; that same year he won World U20 silver in Lima in 10.22, becoming the first Thai athlete to medal in that event at the championships.

In 2026 he took 100m silver at the Asian Championships and at the World University Games, and reached the World Championships semifinals in Tokyo in 10.17. Three seasons hovering around 10.0x, and then at the 2026 SEA Games he ran 9.94 — his first time under ten seconds, and the first by a Southeast Asian athlete in legal conditions — before winning gold in 10.00 in the final. That jump came from paying down the debt over the first sixty metres, not from any miracle.

There is a part of the story the results boards do not tell. 9.90 seconds in Asia is a gold medal and a Games record. 9.90 seconds at an Olympics buys nothing. At Paris 2026 Noah Lyles won in 9.79; at Tokyo 2026 Marcell Jacobs took gold in 9.80. The distance from 9.90 to 9.80 is a little over a metre on the track, and that metre is the hardest metre in the sport.

That arithmetic shows up in the comparative data: had Boonson run 9.90 at last year's World Championships in Tokyo, he could only have finished fourth. The Olympic gold medal he spoke about after the race is not remotely fanciful, but it demands something other than his current speed: the ability to repeat three races in two days, and an opening 60m that is no longer tight.

Behind that track, the stands still tell another story. When the stadium is empty, ordinary voices become leaders: a woman coach leading a relay squad, a technician noting every run for her athlete, people nobody interviews who nonetheless stay until the last race of the morning. The men's 100m brings in sponsorship, television and tickets; the women's events still live on what is left of the budget.

And there is one more pressure no milestone can measure. Boonson is expected to contest three other events, including the 200m and the relay, with the highest target in all of them. For a twenty-year-old with a history of hamstring trouble, asking him to prove himself in every round is the fastest way to turn a season into an injury.

What I keep from the night of 25 September is the forty-seven minutes between the two records, more than the 9.90 itself. Records are born in the hours nobody watches, and broken in hours shorter still. If 9.90 is now the new floor for Asia, the question I carry home to Vietnam is a simple one: who will be the first to step onto that floor on the women's side of the track?