McIntosh absolutely dominated the field, swimming to a time of 2:01.99. Despite leaving her competitors behind, there was some slight disappointment by the 18-year-old phenom after she touched the wall and realized that she came within 18 hundredths of a second of erasing the oldest record in women's swimming.

Canada’s Summer McIntosh capped a dominant world swimming championships with her fourth gold medal on Sunday, winning the women’s 400-metre individual medley in championship-record time.

Summer McIntosh is off to a perfect start at the swimming world championships with two gold medals in two days.