Speed Journal: The 493 km/h Smash and the Shortest 6.7-Metre Journey in Sport

Speed Journal: The 493 km/h Smash and the Shortest 6.7-Metre Journey in Sport

A Shanghai night in August. The air conditioning was running at full power, but I still pulled my chair close to the screen with a pencil in hand and a sheet of graph paper in front of me, reused for the fourth time. On screen was an eleven-second rally I had rewound seven times. Not to see who won the point.

I was counting footsteps.

Seven steps for a cross-court defensive retrieval. Three steps to return to base. One reverse jump. Placed next to a 100-metre sprint, this player's first acceleration is equivalent to taking the whole body from a standing start to roughly 12 km/h in under half a second, then braking completely, then pushing off again, then braking again. Four times in a single rally. And that rally was only the eleventh point of the second game.

In the bottom corner of the screen, the speed gun flashed: 421 km/h for the winning smash. The sound of the racket cracked dryly through the apartment. In the corridor outside, the neighbours heard nothing. In the arena a thousand kilometres away, the stands were empty too.

I sat there with something that has followed me through seventeen years in this profession: among all racket sports, is there any metric sold to audiences that is prettier than reality?

Where exactly is the 493 km/h measured?

In 2026, Tan Boon Heong, the Malaysian men's doubles player, was credited with a 493 km/h smash. It remains the fastest stroke ever recorded in badminton, and it has survived more than a decade as a media legend — reprinted on posters, on product packaging, in the opening montages of tournaments. Four years later, Denmark's Mads Pieler Kolding was credited with 426 km/h.

I have spent years re-reading the technical documentation on how these figures are produced, and what I found is far less glamorous than what appears on the scoreboard graphic.

At most tournaments equipped with speed sensors, the device is positioned near the racket face at the point of contact, or a very short distance behind it. The shuttle sits on the string bed for roughly one thousandth of a second. Which means the 493 km/h figure describes the shuttle's velocity at the instant it leaves the strings — not its velocity when it arrives at the opponent.

The distance between those two moments, in badminton, is the largest in any racket sport.

I once sat beside a measurement engineer at a tournament in Kuala Lumpur. He told me something I wrote down verbatim in my notebook: "We measure the stroke. We don't measure the shuttle." That distinction sounds trivial, but it determines the entire way audiences understand this sport.

Because at the other end of the net, the shuttle is a different object altogether. And that is where every misunderstanding begins.

The shuttle decelerates faster than any object in sport

A badminton shuttle has an unusual construction: a cork or synthetic base, and sixteen feathers arranged into a cone above it. In flight, that cone generates enormous drag. In published aerodynamic studies of the standard tournament shuttle, the shuttle loses the majority of its velocity within the first three to five tenths of a second after leaving the racket.

More concretely: a smash measured at 420 km/h near the racket face arrives at the opponent at only about a quarter to a third of that speed — roughly 100 to 140 km/h. World-class smashes are typically measured between 350 and 420 km/h, and at the receiving end they become fast but entirely returnable shots.

Set a tennis serve beside that. A tennis ball also decelerates, but far more slowly: a 220 km/h serve typically arrives at the receiver at around 130 to 160 km/h. The deceleration ratio is dramatically lower. And here is the crucial point: in tennis, the radar reading is close to the speed the opponent actually faces. In badminton, it is not.

One technical detail rarely mentioned: the standard tournament shuttle must pass the World Federation's speed test. In that test, a player strikes a full-power underhand stroke from one back boundary line, and the shuttle must land between roughly 530 mm and 990 mm short of the opposite back boundary line. A shuttle landing shorter is considered too slow; one landing further is considered too fast. Notably, that same full-power stroke can produce results differing by a full metre under different climate conditions.

I am not writing this to diminish the beauty of the smash. I am writing it because data does not lie; it only says what people do not want to hear.

Tan Boon Heong's 493 km/h smash was a technically perfect contact. It required the coordination of wrist, forearm, shoulder and hip in a kinetic chain where a tenth of a second of mistiming ruins everything. But when audiences hear "493 km/h", they imagine a shuttle travelling toward someone at bullet speed. The reality on court is different. Across roughly six and a half metres of court, the shuttle sheds speed so fast that a professional has about three tenths of a second to react — and three tenths of a second is a window that someone with fifteen years of training can handle.

It is also why I distrust comparisons like "the smash is faster than a Formula One car". They are arithmetically correct and athletically wrong.

A badminton court is smaller than you think, and that changes everything

A badminton court is 13.40 metres long. It is 6.10 metres wide in doubles and 5.18 metres wide in singles. The net is 1.524 metres at the centre. It is one of the smallest playing surfaces in any net-based combat sport.

That smallness creates a paradox. Because the court is small, shuttle flight time is short, so rallies end quickly in terms of shot paths. But because the shuttle decelerates so fast, that short window is packed with decisions.

Take a cross-court shot from one rear corner to the opposite rear corner: roughly six point seven metres of flight path. A world-class men's singles player covers that in about one second, after pushing off from the central base. But before running, he must do something else: read the opponent's racket face, decide within roughly two tenths of a second, and execute the split step.

The split step is the least discussed technique in badminton commentary and the most decisive variable. It is a small hop followed by landing on both feet, spread, timed precisely to the opponent's contact with the shuttle. Land too early and the player is stuck, unable to change direction. Land too late and he loses momentum. The correct window is two to three tenths of a second, and it must be repeated on every single point of a match that can last from forty-five minutes to over ninety.

Put another way: a world-class men's singles player performs roughly eighty to a hundred split steps across a three-game match, plus four hundred to six hundred movement steps in various directions. Total distance covered in an elite men's singles match typically lands between four and six kilometres, depending on the two players' styles.

That is why I started counting footsteps years ago, and why I always feel something is missing when reports talk only about smash speed.

Why step frequency says more than smash speed

From athletics, I learned something during frame-by-frame analysis sessions in London in 2026. When a 200-metre sprinter is in late acceleration, his step frequency typically lands around 4.8 steps per second. European sprinters in the same group usually reach about 4.5 steps per second. That three-tenths-of-a-step-per-second difference, multiplied across the whole race, produces a gap the eye cannot see but the clock records.

In badminton, the logic is similar but more complex, because the footwork never travels in a straight line and never reaches steady state. I have spent many evenings counting the footsteps of top men's singles players, and what I recorded shows a fairly clear pattern.

Strong defenders tend to have higher step frequency in the first three steps of each movement and lower frequency in the last three. They accelerate early to claim position, then decelerate under control to stay balanced on contact. Strong attackers do the opposite: a slightly slower start, but a very long, decisive final step, because they need momentum to jump into the smash.

The conclusion I drew from counting steps is something I have never seen printed on any statistical sheet: in modern men's singles badminton, the player who wins the point is usually the one with the faster first three steps, not the one with the harder smash.

I cross-checked this by rewatching matches of elite players across two decades. The pattern repeats often enough for me to trust it. And it explains something fans have long wondered about: why some players with only decent smash speed still beat players whose smashes are measured far higher.

In doubles, the picture changes. Average rally length in elite men's doubles is shorter than in singles, landing around five to eight shots. But decision speed is higher, because two players share a 6.10-metre-wide court. The front-court player in men's doubles must react to shuttles travelling less than three metres, meaning reaction time can drop below two tenths of a second. Counting steps in doubles is therefore much harder, and I have not yet found a way to record it accurately enough.

Four steps to save a point

In a cross-court defensive rally, a player must execute a sequence that, taken apart, looks biomechanically absurd. Split step. Long crossover step to expand reach. Deep lunge on the striking leg. Recovery step to pull the body back. Four steps, but never the same four steps.

The deep lunge is the most expensive. In a deep lunge to the rear corner, the lead thigh absorbs a force equivalent to several times body weight. This is why knee and ankle injuries are so prevalent in the sport, and why professionals spend enormous time on lower-body strength work.

Nguyen Tien Minh is the player I followed most closely in this respect. Across a career spanning more than twenty years and four Olympic Games, he was known for endurance and stubborn defence. Watching him move, it becomes obvious that speed is not measured by a single jump — it is measured by the ability to repeat a deep lunge in the seventieth minute, when the legs are heavy and the lungs are burning.

Kylian Mbappe showed me that speed is not a measure of distance; it is a measure of courage. In badminton, I would add a second clause: speed is also a measure of tolerance for repetition.

I once wrote about Su Bingtian's 9.83 seconds in Tokyo in 2026. What made that run was not that he ran faster — it was that he changed his foot strike angle after six months of unresisted simulation training. That was a technical reconstruction, and it parallels what a badminton player goes through when rebuilding his entire footwork at twenty-five.

Both cases show the same thing: improving speed at the elite level rarely comes from pushing harder. It comes from removing unnecessary movement.

Tactics have drifted away from the smash

Looking at the history of major tournaments over two decades, a clear shift is visible in how top players construct points.

The era I call the direct-attack era lasted a long time, tied to players who could end a point with a smash from mid-court. Afterwards, players who built their game on control and endurance gradually gained the upper hand. This does not mean the smash disappeared. It means the smash became a tool for finishing a process rather than a tool for starting one.

I track elite men's singles matches and record three simple metrics: average shots per rally, the number of times a player is forced to the four rear corners per rally, and the number of times a player must strike from an unbalanced position. The results show a trend I believe matters more than any speed metric.

Average shots per rally in elite matches have risen over two decades. Points last longer. Movement to the four rear corners has increased. And unbalanced strikes have risen sharply, because players force opponents to move more before delivering the finishing blow.

The consequence is a changed physical demand. A player with only a hard smash will struggle against someone who can extend a rally to the fifteenth shot. This has been known in coaching theory for a long time, but it is still not fully reflected on the statistical sheets audiences see.

I believe this is one of the reasons East Asian and Southeast Asian players, with a deep tradition of rigorous physical training from childhood, continue to hold positions near the top of the world. Attacking technique can be learned in a few years. The physical foundation to repeat a defensive retrieval on the fifteenth shot takes a decade.

The contrarian view: the trap of a beautiful metric

I want to spend this section on something those of us in sports media rarely admit.

Smash speed is a good media product. It is simple, it is impressive, it is easy to put on a broadcast graphic. A metric like that helps a sport reach new audiences, and I do not deny that value. But when a good media metric becomes the only standard for judging technical quality, it creates a blind spot.

The first blind spot is the measurement point. As I outlined, the metric measures the stroke, not the shuttle. Fans compare players' smash speeds as if comparing 100-metre sprint times, when in reality they are comparing contacts measured at different moments, in different places, by different devices, at different tournaments.

The second blind spot is the link to results. A smash measured higher does not mean more points won. In many matches I have tracked, the player with the higher average smash reading was the one who lost, because he spent more energy per point and by the third game no longer had the resources to repeat it.

The third blind spot is commercial. Equipment brands use speed metrics as a sales tool, which is normal in business. But when those metrics enter coaching curricula for children, they produce a generation of young players who believe raw stroke power is the shortest path to the top.

I once sat in an amateur club in Ho Chi Minh City on a dry-season evening. There was a group of about twelve recreational players, aged twenty to fifty. None of them counted footsteps. But when I asked about the smash, every one of them knew the highest figure they had ever heard of. That is what I call the gap between data that is broadcast and data that is used.

An empty stadium still echoes with applause, from walls that have witnessed far too much. But within those walls, the thing most thoroughly recorded is often the metric that matters least.

Badminton lags behind other sports in data

Something notable: badminton, despite having hundreds of millions of players worldwide, trails comparable sports in detailed data collection.

In tennis, ball-tracking systems have been standard at major events for years. These systems record ball position, speed, bounce point and trajectory, enabling stroke-by-stroke analysis. In basketball, motion-tracking systems measure distance covered, running speed, and defensive metrics that never appear on the box score.

In badminton, comprehensive tracking at an equivalent level is still not widespread across enough tournaments. Most analysis still relies on video review and manual counting, which is why published figures often vary between providers. Even something as basic as a player's distance covered in a match can differ meaningfully between two suppliers of the same data.

For Vietnamese badminton, the gap is wider. Leading players such as Nguyen Thuy Linh and Le Duc Phat compete on the international circuit, but detailed data on their playing patterns is mostly collected by opponents and foreign teams. This is a real disadvantage, even if it is not visible on the ranking table.

In transfer windows and coaching reshuffles, data becomes an asset rarely discussed. A team with a good data system knows which shot an opponent favours when pushed to the left rear corner at 15-18. A team without one relies on memory and feel.

Every figure on a transfer sheet was once an unpriced dream. And in badminton, most of those dreams remain uncounted.

What to learn from the people who count footsteps

People call it a mistake. I call it data about things that have not happened yet.

When I sat in London in 2026 counting the step frequency of a 200-metre sprinter, I did not know the method would follow me into badminton. But the method does not belong to any sport. It belongs to how we look at movement.

A 100-metre sprinter and a badminton player defending a rear corner share the same problem: how to take the body from rest to peak speed in the shortest time, then stop without destroying the knee joint. The sprinter has ten seconds to solve it once. The badminton player has over an hour to solve it hundreds of times.

That is why I believe the future of badminton analysis lies not in measuring more smashes. It lies in measuring the intervals between shots, the footsteps nobody sees, and the decisions made before the shuttle leaves the racket.

In a season without spectators, I heard the heartbeat of the game more clearly than ever. Matches played in empty arenas gave me something a packed stand never could: the sound of footsteps. Rubber soles against flooring, breathing, the racket meeting the shuttle. With no roar to cover it, a badminton match becomes a recording of movement.

I have spent years listening to that recording, and what I learned is this: most of what decides a point happens before the shuttle is struck.

I came to athletics on my feet, but I stayed for the stories. Badminton gave me another kind of story: the story of players who win points with their first three steps.

When the match ends and the scoreboard goes dark, what remains is not 421 km/h. What remains is the three steps that player took when his legs were heavy, his lungs were burning, and he still chose to move.

Speed journal.