Marrit Steenbergen and 56.18 Seconds: The Women's 100 IM Map That Is Being Misread

Marrit Steenbergen and 56.18 Seconds: The Women's 100 IM Map That Is Being Misread

The wall touch in the women's 100-meter individual medley final was exactly 0.08 seconds faster than Marrit Steenbergen's own previous swim. In the stands, that interval is shorter than a blink from a front-row seat. To someone who reads data for a living, 0.08 seconds is a decodable signal: it tells you the athlete has just grazed her technical ceiling, and that ceiling, placed beside Gretchen Walsh's lane, sits at a distance that is anything but small.

I was not in that pool. I was in Saigon, in front of a screen, reopening the results sheet after the race ended. My job is not to cheer when a record falls. My job is to ask where this record sits on the map of its event, and where people are misreading it.

In this case, the misreading hides in one small word: "second." Steenbergen is called the second-fastest swimmer in history in the women's 100 IM. That phrasing is correct about the performer but wrong about the performance. Her time ranks eighth on the all-time list, not second. Between those two numbers lies a gap that mass media routinely erases, and that a data analyst is not permitted to erase.

Anchor Point: An Event Without an Olympics

To read this record correctly, you must first understand what the 100-meter individual medley is and what it is not. In long course (50-meter pool), individual medley has only two distances contested at the biggest stage: 200 meters and 400 meters. The 100-meter IM exists only in short course, meaning a 25-meter pool. In other words, this event was born from the structure of the short-course pool, not from the Olympic program.

This matters more than it appears. When a record is set in an event absent from the Olympics and absent from the long-course world championships, its value must be repositioned. It is still a real achievement, still officially recognized, still part of the world swimming federation's competition system. But it does not share a tier with an Olympic gold medal, nor with a long-course world record.

Technically, the short-course 100 IM is a four-length race with three turns. The swimmer does butterfly, then backstroke, then breaststroke, then freestyle. That order is mandatory and cannot be changed. Each length is only 25 meters, meaning the share of time spent on turns and on the underwater phase after each turn is a significant portion of the total. In long course, a swimmer can compensate for a slow turn with distance-swimming power. In short course, there is no room to compensate.

I always remind my students of this before they read any short-course record: short course rewards good turners and punishes poor turners more ruthlessly than long course. The same swimmer, the same fitness, can differ by several tenths of a second purely on the quality of three turns. So when someone says Steenbergen just swam 0.08 faster than herself, I do not read that as "she got stronger." I read it as "she just optimized some detail in her three turns, or in her underwater phase, or in her pacing."

The problem is that I have no split data here. No per-50-meter figures, no start reaction time, no underwater distance after each turn. Without data, you are not permitted to conclude about mechanism. I am only permitted to say that the 0.08-second improvement sits within the normal range of variation between two swims by the same person, and that it is consistent with a minor refinement rather than a technical overhaul. That is a low-confidence conclusion, and I mark it as such.

Event Tier: The World Cup Is Not the Olympics

The Swimming World Cup is a multi-leg series, held in short course, sitting on the third rung of the international pyramid, below the Olympics and below the long-course world championships. Its role is to create in-season racing rhythm and to offer opportunities to accumulate prize money and points. This is a deliberate competition structure, and it explains why the "Triple Crown" concept — winning the same event across all legs of the tour — appears as a competitive incentive.

When a swimmer wins two events and aims to complete a triple crown at the next leg, that is not just a story about results. It is a story about competition structure. Athletes race densely, enter many events, and travel between legs across consecutive weeks. Cumulative fatigue across legs is a real variable, not an assumption. A swimmer can swim very well at the first leg and decline at the last leg for fitness reasons, not technical ones.

I once tracked a season in which one athlete entered too many events across consecutive legs. By the third leg, that athlete's times dropped noticeably, and the media called it "a decline in form." But the fitness data told a different story: cumulative racing load had exceeded the recovery threshold, and the so-called decline was simply the inevitable consequence of scheduling. There was nothing mysterious about it.

For Steenbergen, entering many events at the World Cup fits the role of a versatile Dutch national-team swimmer. Someone who swims both individual medley and freestyle, both individual events and relays, is often entered in many slots because of her high utility value. That is good for the team, but it also raises a question about managing racing load. That question cannot be answered without knowing exactly which events she entered, and I do not have that information in hand.

The Number 56.18 and the 1.07-Second Gap

Place the numbers side by side. The world record in the women's short-course 100 IM is 55.11 seconds, held by Gretchen Walsh of the United States. Steenbergen just swam 56.18, breaking her own European record of 56.26. The gap between 56.18 and 55.11 is 1.07 seconds, or nearly 1.9 percent.

To outsiders, 1.9 percent sounds small. To insiders, this is a large gap over 100 meters. In an event where each turn can decide a placing, one second is the distance between a world champion and someone off the podium. When that gap is measured in more than a second, we are no longer talking about two evenly matched rivals. We are talking about a leader and a chase pack.

Steenbergen sits at the front of that chase pack. That is a respectable position, but it must be named correctly: she is the best of the rest, not a co-favorite for the number-one spot.

One more detail needs to be read precisely. Steenbergen's 56.18 ranks eighth on the all-time performance list, while her old 56.26 ranked ninth. She just pushed herself up one notch on the performance list. This is a genuine step forward, not a coincidence.

But the seven performances above her all belong to one person: Gretchen Walsh. Walsh owns the seven fastest performances in the event's history. This is a rare degree of ownership concentration in elite swimming. Normally, an event has several swimmers sharing the positions in the all-time top 10. Here, one person occupies nearly the entire top of the list.

I checked this repeatedly because the number is hard to believe. But the data is consistent: the seven fastest performances all belong to Walsh. This means that when we call Steenbergen "second," we must understand it as second among those who are not Walsh. The precise phrasing is: Steenbergen leads the rest of the field.

The "Second" Trap: Performer Versus Performance

This is the point I want to dwell on longest, because it is where the general reader is most easily misled.

In swimming, there are two entirely different rankings. The first is the performance list, the list of fastest times, ranked swim by swim. The second is the performer list, the list of swimmers with the best personal marks, each appearing only once with their personal best.

Steenbergen ranks second on the performer list, behind Walsh. But she ranks eighth on the performance list. The two numbers do not contradict each other. They simply answer two different questions. The performer list asks: "Who is the second-best swimmer ever?" The performance list asks: "What was the second-fastest swim ever?"

The answer to the second question is a Walsh swim. And the third-fastest swim is also Walsh's. And so on through the top seven. Steenbergen only appears at eighth, as her own personal best.

Why does this matter? Because media routinely merges the two lists and writes lines like "the second-fastest swimmer in history." Readers understand it as "she is only slightly behind the number one." But in reality, she trails the number one by 1.07 seconds, and the seven fastest swims in history are not hers.

I call this the title trap. It is not a lie. It is a technically correct phrasing that creates a false expectation. And when expectations are pushed to the wrong place, people will be disappointed in a swimmer they should have admired.

When the stands fall silent, home advantage dissolves into a number near zero. I borrow that line to say something similar in swimming: when a ranking is read in merged form, a true second place can actually be eighth, and the real gap between two people is hidden by the very way it is named.

The Dominance Map: One Queen and the Rest

The picture of the women's short-course 100 IM can be drawn in four tiers.

Dominant tier: the United States, with Gretchen Walsh holding the world record and the seven fastest performances in history. This is near-absolute dominance.

First challenger tier: the Netherlands, with Marrit Steenbergen holding the European record, second on the performer list and eighth on the performance list.

Second competitor tier: the United States, with Kate Douglass, third on the performer list at 56.34 seconds.

Potential tier: Belgium, with Roos Vanotterdijk, a young swimmer who just took runner-up.

Reading this picture reveals a structural feature: two of the top three performers are American. The depth of American swimming in this event lies not only in the leader but in having several world-class swimmers at once. That is the result of a training system with depth, from the collegiate level to professional training groups.

Steenbergen is the principal European counterweight. She represents a different model: the Dutch national and club system. This is a system with tradition in medley and freestyle events, and producing a versatile swimmer like Steenbergen is the logical result of that system.

What I want to emphasize is the sustainability of the lead. When one person owns the seven fastest performances in history, that person is not merely leading. That person is redefining the standard of the event. Rivals are no longer competing with a person; they are competing with a new standard.

I have seen this phenomenon many times in other events: a swimmer appears and pulls the entire event's standard up a tier. The rest must evolve or accept a place behind. In this case, the question for Steenbergen and Douglass is not how to beat Walsh in a single swim. The question is how to narrow the 1.07-second gap across many consecutive swims.

The Competitive Triangle: Steenbergen, Douglass, Walsh

These three names form the competitive core of the event. And the numbers show a clear three-tier structure.

Walsh is at the top tier, with the 55.11 world record and the seven fastest performances in history. Her gap to the next person is over one second.

Steenbergen is in the middle tier, with the 56.18 European record. She leads the chase pack.

Douglass is at the lower edge of the leading group, at 56.34, third on the performer list.

The gap between Steenbergen and Douglass is 0.16 seconds. This is a small gap, within the range that can reverse between swims. That means the contest between these two is a real contest, able to change from meet to meet. The contest between them and Walsh, however, is not yet a contest on the same tier.

Steenbergen's 56.18 widened her gap over Douglass to 0.16 seconds. Previously, that gap was narrower. This is a noteworthy signal: while the race with Walsh remains distant, Steenbergen is consolidating her second place within the chase pack.

I want to be clear about how to read these gaps. A 0.16-second gap does not say Steenbergen is definitely better than Douglass. It says that in this swim, Steenbergen was faster. To speak of the relative strength of the two, you need a series of head-to-head swims across many meets, ideally across different pools and conditions. One swim is a data point, not a trend.

This is the principle I always repeat: correlation is not causation. If two data series move together, do not rush to conclude that one causes the other. You must point to the specific mechanism linking them. In this case, Steenbergen being faster than Douglass in one swim does not prove she has a better fitness or technical foundation. It only proves that in that swim, all factors combined, she finished first.

Roos Vanotterdijk and the Signal from the Potential Tier

In the results sheet, there is a less-noticed name worth analyzing: Roos Vanotterdijk of Belgium, who took second.

What is notable is not the runner-up position but the nationality and age. A young swimmer from a federation outside the dominant group, appearing at the front of a medley event, is a signal about the talent supply chain. Belgium is not a traditional swimming power. When one of their swimmers enters the leading group in a technical event like the individual medley, that is a marker to track over the next few seasons.

Of course, I must lower the confidence of this claim. One runner-up finish does not make a trend. It only opens a hypothesis. That hypothesis is: a new European challenger may emerge alongside Steenbergen in this event. To confirm it, we need to see Vanotterdijk hold a top position across several meets, and improve her personal best over time.

In my profession, a common mistake is inflating a single result into a long-term trend. I made that mistake early in my career, and I remember clearly the feeling when my model was refuted by reality. Since then, I always place a note beside each prediction about the conditions for it to be correct. For Vanotterdijk, the condition is: she holds a position in the leading group across at least three consecutive meets.

Era Context: Why These Records Are Comparable

A technical question the attentive reader will ask: are these records comparable, given that swimming history has periods dominated by high-tech suits?

The answer is yes. The records in this case were all set in the textile era, meaning after 2026, when the world swimming federation banned high-tech suits. Before 2026, a wave of world records fell thanks to performance-enhancing suits, and those records were later excluded from direct comparison with textile-era records. But Walsh's and Steenbergen's records both belong to the textile era, so they sit within the same frame of reference.

This means the 1.07-second gap between the two is a real gap, not distorted by the suit factor. This is an important point because it removes an easy explanation. One cannot say Walsh's record came from technology. Both swam under the same suit conditions.

I always check this factor before making any comparison between records. If you skip it, every comparison can be skewed. In this case, the check yields a favorable result: the numbers hold up.

The Counterintuitive Angle: The True Value of a Non-Olympic Record

Here, I want to offer the most counterintuitive angle of this analysis, and it may irritate some people.

The European record Steenbergen just set is a real achievement, worthy of recognition. But its competitive value, judged by the competition system, is lower than the value media assigns to it. The reason lies in the very nature of the event: the 100-meter individual medley is absent from the Olympics and absent from the long-course world championships. It exists only in short course.

This creates a paradox. A swimmer can be the second-best ever in the short-course 100 IM and still have no chance to contest that event at the biggest stage. The career value of this record is limited by its lack of an Olympic-level outlet.

So when assessing Steenbergen's career, I do not take the 100 IM record as the main yardstick. I look at the 200 IM, the freestyle events, and the relays. Those are where her career value is measured by medals at the biggest stage.

This is where general fans and data analysts often disagree. Fans see a record and get excited. Analysts see a record and ask: what does this record contribute to the athlete's larger goals? If the answer is "not much," the excitement needs to be adjusted to the right tier.

I am not saying this record is meaningless. I am saying it must be positioned correctly. It is an achievement at the World Cup tier, in a non-Olympic event, in a year that is not a major-games year. That is a good achievement within its context, not a career-defining milestone.

A tactical era dies when no one reads its data table anymore. I borrow that idea to speak of non-Olympic records: they exist, they are recognized, but if no one reads them at the right tier, they will be inflated in one place and underrated in another. Both are ways of misreading.

Operating Conditions: Turns and the Underwater Phase

Back to technique, because this is where everything is decided in short course.

In a short-course 100 IM, there are three turns. Each turn is a chance to gain or lose time. After each turn, the swimmer performs the underwater phase, usually a series of dolphin kicks. In short course, the share of time spent on turns and underwater phases is far higher than in long course, because the total swimming distance is only 100 meters.

This means a swimmer with good turn technique gains disproportionately in short course. Conversely, a swimmer with average turn technique is punished heavily. This is why a swimmer's short-course and long-course times can differ markedly, and why the two types of times must not be compared directly.

For Steenbergen, her status as a short-course specialist in this event is a reasonable inference, since the 100 IM only exists in short course. But to claim she has superior turn technique, I need split data. That data is not in my hands. So I am only permitted to say she is suited to short course, not that she has the best turn technique.

This is the boundary between inference and assertion. A data analyst must respect that boundary. When data is missing, you say "cannot yet assess," rather than filling the gap with guesswork.

I remember a time years ago when I drew a conclusion about a swimmer's turn technique based on my feel while watching the race, not on split data. Later, when the data arrived, my conclusion was entirely wrong. Since then, I set a rule for myself: never conclude about a technical mechanism without split data. This rule makes my writing less flashy in some places, but it keeps me honest.

Conditions for the Predictions to Be Correct

Whenever I make a prediction, I always note the conditions for it to be correct. For this case, the predictions and their conditions are as follows.

First prediction: Steenbergen will continue to lead the chase pack behind Walsh in this event in the short term. Condition for correctness: she maintains her racing frequency and suffers no serious fitness problem. Condition for error: Douglass breaks through, or Steenbergen declines for fitness reasons.

Second prediction: the gap between Steenbergen and Walsh will not be erased in the short term. Condition for correctness: Walsh continues to race this event. Condition for error: Walsh is absent long-term for some reason.

Third prediction: the world record in this event may be broken by Walsh herself, not by Steenbergen, in the short term. Condition for correctness: Walsh continues to improve. Condition for error: another swimmer, perhaps Douglass or Vanotterdijk, makes a leap.

All three predictions carry medium confidence. I do not assign them specific probabilities because I lack the data to compute them. But I state the direction and the conditions clearly.

Why I Wrote This

Based on my experience tracking races, I notice a recurring pattern in how sports media handles records. When a record falls, the first reaction is to call it a historic moment. The second is to assign the athlete a high position in the rankings. The third is to raise expectations for the upcoming meets.

These three reactions are usually right emotionally and wrong in terms of data. A record can be historic at its tier but not at the highest tier. A ranking position can be second on the performer list and eighth on the performance list. And expectations for the next meet can be built on an unstable foundation.

This article was born from a wish to correct those three reactions. I do not want to diminish Steenbergen's achievement. I want to place it in its correct position on the map. An achievement positioned correctly is more durable than one that is inflated. When people understand an athlete's position correctly, they will follow that career with more realistic expectations, and therefore be less disappointed when results fall short.

Ordinary people watch the goal to understand the match. I watch the match to understand the months. In swimming, people watch a record to understand a moment. I watch the record to understand an entire career arc, an entire training system, an entire competitive map. One swim is a point. A career is a line. And the map is an entire plane.

Anchor for the Next Round

Marrit Steenbergen's 56.18 European record is a real achievement, set in the textile era, in a non-Olympic event, within a short-course series. It lifts her to second on the performer list and eighth on the performance list. It widens her gap over Kate Douglass to 0.16 seconds. It does not narrow the 1.07-second gap to Gretchen Walsh.

The signal to watch in the next round is not whether Steenbergen breaks another European record. The signal is how she allocates her resources between this event and the events with an Olympic outlet. A versatile swimmer must always choose where to concentrate effort. That choice will say more about her career than any short-course record.

And the second signal to watch is Roos Vanotterdijk. If the young Belgian holds a position in the leading group for a few more meets, this event's map will gain a new arrow. If she vanishes from the front, her runner-up finish was just a single bright point on a single evening.

The data does not lie. But it only tells the truth when the reader is willing to read to the end, instead of stopping at the first number the eye meets. 56.18 is the first number. Walsh's seven performances are the number behind it. And the gap between those two things is the real story of this event.