Aubrial MacKay Commits to Texas: The Time Curve of a Class of 2028 Swimmer

At the women's 100 butterfly final at Winter Juniors East 2026, a 16-year-old from Michigan touched the wall in 53.33 seconds. Two months later, the same swimmer went 53.09 at the OLY Open. By NCSA Spring Championships she had pushed the 200 butterfly down to 1:56.82 and the 200 IM to 2:01.37. Four time markers, all personal bests, inside a single year. To someone who works with data, that is a curve, not four isolated flashes.

Aubrial MacKay of Owosso, Michigan, has announced her verbal commitment to the University of Texas for the 2028-29 season. She trains year-round with OLY Swimming in Ortonville, Michigan. In her social media statement she thanked her family, her four younger brothers, and coaches Adam, Chase, Carol, Brandt and Chad, closing with See you in 28, HOOK EM.

For a Vietnamese reader, this item passes by quickly. An American girl, an American university, a season still far away. But place MacKay's time board next to our own development system and it tells a different story, about how one swimming nation builds a pipeline, and about the stretch we have left empty.

Operating base: two systems, two ways of counting

Competitive swimming in the United States runs on three tiers. The first is year-round club swimming, where MacKay trains with OLY Swimming. The second is the age-group and seasonal championship circuit, where Winter Juniors East, NCSA Spring Championships and Indy Sectionals sit. The third is college recruitment, where Texas is waiting for her in August 2028.

The first distinction to make inside MacKay's time board is that two units of measurement run in parallel. The indoor season uses short course yards, a 25-yard pool. The outdoor season uses long course meters, a 50m pool. The two differ in the number of turns, the number of underwater push-offs, and the way points are converted. A swimmer can be very strong in yards and only decent in metres. The reverse is also true, and that is why college coaches always read both boards before committing a scholarship.

In yards, MacKay has 23.12 in the 50 free, 52.29 in the 100 free, 25.14 in the 50 back, 53.69 in the 100 back, 1:57.33 in the 200 back, 53.09 in the 100 fly, 1:56.82 in the 200 fly and 2:01.37 in the 200 IM. In metres, she has 26.67 in the 50 free, 57.65 in the 100 free, 2:06.47 in the 200 free, 28.61 in the 50 back, 1:02.98 in the 100 back, 2:21.18 in the 200 back, 27.77 in the 50 fly, 1:00.04 in the 100 fly, 2:14.15 in the 200 fly and 2:20.77 in the 200 IM.

She holds Summer Nationals cuts in the 50 back, 100 back, 100 fly and 200 fly. She holds Summer Juniors standards in the 100 free, 200 back, 50 fly and 200 IM. SwimSwam lists her as an Honorable Mention on its Way Too Early ranking for the high school class of 2028.

One parameter has to be stated up front: Texas moved to the SEC from the 2026-25 season. That means its internal competitive standard is now measured by SEC scoring, where each event offers only two A-final slots and the rest of the field is pushed into B and C finals. This is a base parameter, not a footnote.

The time curve, read layer by layer

The simplest amateur question I always ask before any time board is this: how fast is this, if converted into the unit the rest of the world uses?

Average conversion factors from short course yards to long course meters sit around 1.10 to 1.12 depending on the event. For the 100 butterfly the common factor is 1.11. Take 53.09 and multiply by 1.11, and you land near 58.9 seconds. MacKay swam 1:00.04 long course at Indy Sectionals. The gap is about 1.1 seconds.

In the 100 freestyle she swam 52.29 in yards, converting to roughly 58.0 seconds. She swam 57.65 in metres at the end of the season. The gap is effectively zero, leaning slightly in her favour.

In the 200 butterfly she swam 1:56.82 in yards, converting to about 2:09.7. She swam 2:14.15 in metres. The gap is about 4.5 seconds.

In the 200 backstroke she swam 1:57.33 in yards, converting to about 2:10.2. She swam 2:21.18 in metres. The gap is about 11 seconds.

In the 200 IM she swam 2:01.37 in yards, converting to about 2:14.7. She swam 2:20.77 in metres. The gap is about 6 seconds.

A rule emerges clearly: the gap between the two systems widens with distance, and widens most sharply in backstroke and medley events. At 100 metres, most of the gap has already been flattened. At 200 metres, it opens into a grey zone.

The mechanism here can be named in physics rather than guesswork. A 25-yard pool contains twice as many turns as a 50m pool over the same distance. Every turn is a push-off plus additional underwater travel, and underwater travel carries a higher average speed than surface swimming. A swimmer with excellent wall work and butterfly kicking off the wall gains twice over in a yards pool. Move her to a 50m pool and half those turns disappear, the advantage is stripped away, and what remains is aerobic endurance plus pure stroke efficiency.

That is why I read MacKay's board in two separate layers. The yards layer shows a very strong technical base on walls and underwaters. The metres layer shows a long course endurance base that has not yet been tested thickly enough.

One more caveat about the sample. Almost all of MacKay's long course times fall in the early part of the long course season, when training load is still heavy and speed has not been sharpened. This is a weakness in the sample, and I state it plainly: any conclusion about her long course base today belongs to the hypothesis pile, not the conclusion pile.

What stands out is the rate of improvement within the season. At Winter Juniors East she finaled 16th in the 100 back, 13th in the 100 fly and 10th in the 200 fly. Two months later at the OLY Open she dropped the 100 free to 52.29, the 200 back to 1:57.33 and the 100 fly to 53.09. Three different events, one direction. To a data reader, three points moving the same way carry more weight than a single explosion.

A single swim appears once. Its trajectory runs for years.

Event portfolio: the value is in the spread

At American college level, a swimmer's value is not measured by a signature event but by the number of events she can score in for the team. MacKay spans butterfly, backstroke, freestyle and medley. She holds Summer Nationals cuts in four events and Summer Juniors standards in four others. Eight events with national or junior national standards in total.

For a programme like Texas, that number matters more than any single personal best. It means she can plug several gaps in dual meets, and in relay legs, where the butterfly and backstroke slots are always the hardest to fill.

Measured against SEC scoring, a rough projection suggests her current times already reach the B final in the 200 fly and the C finals in the 100 fly and 100 back. She is not far off in the 200 back, 200 IM and 400 IM. She still has two years before she sets foot in Austin.

Set beside the Vietnamese system, the gap shows up in structure. We develop through centralised training centres, select in batches, and most elite swimmers have only one exit door: the national team. In the United States, MacKay has at least three: the age-group circuit, the college system, and the professional club circuit after graduation. When one door narrows, two others stay open.

One domestic reference point is worth comparing. Vietnam's national record in the women's 200 butterfly sits around the 2:09 mark, and around 58 to 59 seconds in the 100 butterfly. MacKay's best long course times at this stage, 2:14.15 and 1:00.04, sit outside those marks. She is 16, with two years of development ahead. But read the number correctly: her impressive yards times have not automatically translated into long course capacity at the same level.

The counterintuitive angle: a commitment is not a signature

A verbal commitment is not a signature. It is a hypothesis with a name attached.

In the American recruitment system, a verbal commitment is a statement of intent, not a legally binding document. A swimmer can change her mind. A programme can change its coach. Across the two years before enrolment, both sides retain the right to adjust. Following decommitment rates in American college swimming over many years, I have seen the figure fluctuate but never reach zero. It is a hypothesis not yet verified by signature.

Second, conversion factors are statistical averages, not laws. A swimmer with superior wall technique will always have a prettier yards board than a metres board. Reading her yards numbers and concluding something about international potential confuses two different quantities.

Third, an Honorable Mention on the Way Too Early list is a market valuation, not a measurement. Lists of this kind are drawn up very early, when the sample for an entire class is only a handful of data points. They are useful to track, useless to conclude from. Every shock has its own probability. We call it a shock only when we have not yet checked the table.

Fourth, and here I want to be most careful: faster times at 16 correlate with college success, but that correlation is not causation. The real mechanism lies in whether a swimmer can sustain her rate of improvement when training volume doubles, when the meet calendar thickens, when the environment shifts from a small club to a large centre. Plenty of age-group standouts peak early and plateau exactly at the transition to college.

Finally, there is a slice of variance I cannot quantify. MacKay's statement devotes most of its length to family, faith and four younger brothers. That is qualitative data, impossible to put into a model, but it speaks to motivational stability. Across years of watching age-group swimmers, I have noticed that what carries them through hard stretches is not speed but the support structure behind them. That part has no conversion factor.

Signals to watch

Based on my experience following age-group swimming and the American college recruitment system over many years, I set four markers to test the MacKay hypothesis over the next two years.

Marker one, the 2026 long course season. If she takes the 200 butterfly under 2:10, the gap between the two systems effectively closes in her signature event. That is the strongest signal.

Marker two, the 100 butterfly long course under 59 seconds. At that threshold she enters medal contention at regional level, and touches SEC A-final standard by the time she arrives at college.

Marker three, the 100 backstroke long course under 1:01. This is the event with an abnormally wide gap between the two systems in the current data, and the one where the indicator needs re-verification.

Marker four, stability across three consecutive meets. A single peak says nothing. Three points in the same direction draw a line.

People look at times to understand a swimmer. I look at the swimmer to understand ten years.

And there is one question I keep for our side. When a 16-year-old from Owosso, a small town in Michigan, can travel from a club pool to a scholarship at a national championship university, the operating conditions were designed before she was born. That pipeline does not create talent. It only does what a pipeline always does: keeps the water flowing in the right direction, for enough years, so a swimmer does not have to find the road alone.

Our question is not who will be next. Our question is where our pipeline connects, and which stretch is still missing between the moment a child learns to swim and the moment that child can make a living from swimming.

MacKay arrives in Austin in 2028. As for us, every season that passes, another cohort burns through its youth without ever seeing the end of the road. That is the board worth reading most.