The United States set the world record in the 4x100 freestyle mixed relay, clocking 3 minutes, 18.48 seconds in the swim world championships

Both Ledecky and McIntosh entered Saturday's event in top form. Ledecky broke her own 800m world record in May at the 2025 TYR Pro Swim Series in Fort Lauderdale with a time of 8:

Ledecky, trailing McIntosh at the 700-meter mark, surged ahead on the final lap, fending off a hard-charging Pallister as McIntosh faded in the closing meters. With the win, Ledecky remained undefeated in the 800-meter freestyle finals event on the world stage dating back to 2012.