Summer McIntosh won her fourth gold medal of the World Aquatics Championships in Singapore with a dominant performance in the 400-meter individual medley.

Summer McIntosh, the 18-year-old Canadian swimming star, rolled to victory Sunday in the women’s 400-meter individual medley, setting a world-championship record and winning her fourth individual gold medal of the event.

The 18-year-old Canadian also claimed gold in the 200-metre butterfly, 200 medley and 400 freestyle in Singapore