Summer McIntosh was less than a second away from rewriting the record book for a second time in as many days.

The Toronto-born swim star gave Katie Ledecky a huge scare before settling for the third-fastest time in history in the 800-metre women’s freestyle on Sunday night at the Canadian swimming trials in Victoria.

McIntosh, 18, crushed the field in eight minutes, 5.07 seconds. Ledecky’s world record of 8:04.12 was set last month.

The American legend also has the second-fastest time in event history.

McIntosh set a world record on the opening day of trials in the 400-metre freestyle.

The Canadian didn’t even race the 800 free at her dominant 2024 Olympics when she won three gold medals and one silver.

McIntosh has set a goal of winning five individual medals at the 2028 Los Angeles Olympics.

The Canadian swimming trials serve as the qualifier for the country’s team for the world championships next month in Singapore.

Expect a Ledecky-McIntosh showdown in the 800 at worlds.