Analyzing Summer McIntosh’s Stunning 200 Fly World Record Swim (Race Video)

2026 Bell Canadian Swimming Trials

She wanted it bad, and after a few agonizingly close attempts, Summer McIntosh finally got her hands on the world record in the women’s 200 butterfly on Sunday during the opening night of action at the Canadian Swimming Trials in Montreal.

The 19-year-old executed a perfect swim to finish in a time of 2:01.65, breaking Liu Zige‘s vaunted super-suited world record of 2:01.81 set in October 2009.

Liu’s mark had stood as the oldest women’s world record on the books, and McIntosh was very vocal about her desire to break the mark last year, when she gave it a good run at the Canadian Trials (2:02.26) and the World Championships (2:01.99).

On Sunday, McIntosh made the biggest difference relative to her 2:01.99 splits on the second 50, while compared to Liu, McIntosh’s third 50 was the difference-maker, out-splitting her by six-tenths.

Split Comparison

Liu, 2009 McIntosh, 2025 McIntosh, 2026
27.19 27.22 27.45
58.08 (30.89) 58.41 (31.19) 58.21 (30.76)
1:30.20 (32.12) 1:30.00 (31.59) 1:29.73 (31.52)
2:01.81 (31.61) 2:01.99 (31.99) 2:01.65 (31.92)

Below, check out the race video, with options for both Canadian and international viewers.

RACE VIDEO

For Canadian Viewers

For non-Canadian Viewers

One discernible difference between McIntosh’s 2:01.99 swim at last year’s World Championships and her world record swim on Sunday was stroke count.

She had a slightly higher tempo in breaking the world record, doing one more stroke per 50 on all but the third length.

Comparing that to Liu’s world record swim from 2009, the Chinese native started off with a longer stroke on the opening length (20 strokes), like McIntosh last year, but had upped her stroke count to 25 on the back half.

While Liu’s stroke appeared to shorten towards the end of the third 50 and into the last length, McIntosh’s increased tempo looked like a deliberate decision from the start.

Stroke Count Comparison

Liu, 2009 (2:01.81) McIntosh, 2025 (2:01.99) McIntosh, 2026 (2:01.65)
1st 50 20  20  21
2nd 50 24  23  24
3rd 50 25  24  24
4th 50 25  24  25
Total 94 91 94

Check out a race video of Liu’s world record swim below:

In addition to increasing her stroke rate, McIntosh was also more consistent in her breathing pattern on Sunday. She usually breathes every other stroke, but sometimes breathes twice in a row. In her world record swim, however, she only had one instance where she breathed twice in a row (early in the second 50).

At the 2025 World Championships, she double-breathed 13 times, six of which came on the third 50. Liu was similar, sometimes breathing every other, sometimes twice in a row.

These changes come after McIntosh joined Bob Bowman and the University of Texas pro group late last summer, after the World Championships.

Bowman is of course the longtime coach of Michael Phelps, who won Olympic gold in the men’s 200 fly three times and held the world record from 2001 until 2019.

McIntosh said post-race that growing up this was the one world record she never thought she’d be able to break, but after coming incredibly close last year, she was able to do so with a few minor tweaks.

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About James Sutherland

James Sutherland

James swam five years at Laurentian University in Sudbury, Ontario, specializing in the 200 free, back and IM. He finished up his collegiate swimming career in 2018, graduating with a bachelor's degree in economics. In 2019 he completed his graduate degree in sports journalism. Prior to going to Laurentian, James swam …

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