Summer McIntosh is the first swimmer to break a world record in three different individual events at one long course meet since Michael Phelps at the 2008 Beijing Olympics.

McIntosh, a triple 2024 Olympic gold medalist, lowered her own 400m individual medley world record on Wednesday at the Canadian trials for the World Championships in Singapore in July and August.

She clocked 4 minutes, 23.65 seconds, beating her previous record of 4:24.38 set at the 2024 Canadian Olympic Trials.

Earlier at this meet, McIntosh reclaimed the 400m free world record (Saturday) and broke a 10-year-old world record in the 200m individual medley (Monday).

She also swam the third-fastest time in history in the 800m free (Sunday) and the second-fastest time in history in the 200m butterfly (Tuesday).

For Thursday, the last day of the meet, she is entered in the 200m free, not one of her primary events, in Victoria, British Columbia.

McIntosh, an 18-year-old from Toronto, has put together one of the best single-meet performances in history.

The list starts with Phelps’ eight-gold-medal effort at the 2008 Beijing Games. There, he broke world records in the 200m and 400m IMs, the 200m fly and the 200m free.

Phelps is the only swimmer to win five individual events at a single Olympics (2008) or World Championships (2007).

McIntosh can match that at this summer’s worlds. She has said she plans to swim five individual events: her three Olympic gold-medal events — both IMs, 200m fly — plus the 400m free and one of the 200m free, 200m backstroke or 800m free.

After worlds, McIntosh plans to move to Austin, Texas, and start being coached by Bob Bowman, who coached Phelps for his entire career.