McIntosh authored more history at Canadian swimming trials in Victoria on Wednesday, breaking her own world record in the women's 400-metre individual relay. The 18-year-old from Toronto touched the wall in a time of 4 minutes,

The 18-year-old Summer McIntosh has made it three world records in less than a week by breaking her own 400-meter individual medley mark at the Canadian swimming trials.

McIntosh came within a whisker of breaking a third world record at the Canadian swimming trials on Tuesday after finishing 0.45 seconds outside Liu Zige's 200m butterfly mark set during the era of the now-banned "super-suits".