ORLANDO, Fla. – Katie Ledecky's 13-year unbeaten streak in the 800-meter freestyle is over, setting up a potential challenge from Canadian phenom Summer McIntosh at the Paris Olympics.

Ledecky and Summer McIntosh (right) have traded victories in multiple 400-meter freestyle meetings in the past year. At just 16, McIntosh is the current world record holder in the event.

Canadian Summer McIntosh became the first swimmer to defeat Katie Ledecky in an 800m freestyle final since 2010, winning at the Southern Zone South Sectional Championships meet in Orlando on Thursday.

Summer McIntosh, a 17-year-old Canadian swimmer, ended the 13-year event reign of Katie Ledecky, beating her in the 800 meter freestyle.

ORLANDO, Fla. (AP) — Katie Ledecky’s 13-year unbeaten streak in the 800-meter freestyle is over, setting up a potential challenge from Canadian phenom Summer McIntosh at the Paris Olympics.

Katie Ledecky's 13-year dominance in an 800-meter freestyle final came to an end when Canada's Summer McIntosh beat her on Thursday in the finals of the Southern Zone South Sectional Championships ...

ORLANDO, Fla. – Katie Ledecky's 13-year unbeaten streak in the 800-meter freestyle is over, setting up a potential challenge from Canadian phenom Summer McIntosh at the Paris Olympics.

Summer McIntosh, top, competes against Katie Ledecky in the 400-meter freestyle at the U.S. Open championships at the Greensboro Aquatic Center in Greensboro, N.C., Thursday, Nov. 30, 2023.