Summer McIntosh has continued to make Canadian history at the 2025 World Aquatic Championships in Singapore.

Following an impressive showing at the Paris 2024 Olympics last summer, which saw her take home four medals, the 18-year-old has added to her collection. McIntosh collected her fourth gold medal in Singapore on Sunday morning, breaking her championship record in the 400-metre Individual Medley with a time of 4:25.78.

This put her total medal count up to five at the championships, making her the most decorated Canadian swimmer at a single World Championships.

MCINTOSH CLAIMS GOLD! 🥇🇨🇦

Summer McIntosh breaks her own 400m IM championship record with a time of 4:25.78 at the World Aquatics Championship 👏 pic.twitter.com/CkFs04Swbs

— CBC Olympics (@CBCOlympics) August 3, 2025

The events that McIntosh took home a medal in included:

Women’s 400-metre Individual Medley (gold)
Women’s 200-metre Individual Medley (gold)
Women’s 200-metre butterfly (gold)
Women’s 400-metre freestyle (gold)
Women’s 800-metre freestyle (bronze)

McIntosh not only made Canadian history, but also swimming history in general. She is now the second woman to win four gold medals in individual events at a single World Championships, next to American Katie Ledecky.

She also joined swimming legend Michael Phelps and Sweden’s Sarah Sjostrom as the only swimmers to capture five medals at a single championship.

With all these accolades, it’s no surprise that McIntosh was also named the 2025 World Aquatics best female swimmer, as she accounted for five of Canada’s nine medals at the event.

Despite all the success, one of her most viral moments of the championships was her being upset after the 200-metre butterfly. She won gold, but was upset about not breaking the world record, which she had been just 0.18 seconds away from besting.

Canada also got a pair of bronze medals from Ilya Kharun (Men’s 100-metre butterfly) and Marie-Sophie Harvey (Women’s 200-metre Individual Medley), as well as another in the Mixed 4 x 100 metre medley relay. Simone Leathead was the sole Canadian silver medalist at the event, picking up her medal in the women’s high diving event.

McIntosh may only be 18, but she is quickly becoming one of Canada’s most impressive athletes of all time.