The Canadian star challenged the all-time mark in the women's 200-meter butterfly and continued her perfect string of races in Singapore.

Australian Kaylee McKeown, who won every backstroke title at the last two Olympics and at the 2023 Worlds, opted not to swim the 50m this year. She owns the world record of 26.86.

McIntosh is aiming to win five gold medals in individual events at the worlds in Singapore, and the first one came Sunday in the 400-meter freestyle on the first of eight days in the pool. Only legendary American Michael Phelps has ever won five individual medals in the worlds. He also did it at the Olympics.