Summer McIntosh v Katie Ledecky: a generational duel set to define the world championships

The teenage phenom from Canada is chasing five golds in Singapore, but her showdown with the sport's longtime 800m free queen could signal a passing of the torch

For the first time in more than a decade, Katie Ledecky may not be the most feared swimmer in the pool. That honor now belongs to Summer McIntosh, the Canadian teenager looking to do what only Michael Phelps has done before her: win five individual gold medals at a single world swimming championships.

Their clash in the 800m freestyle on 2 August is set to be the defining moment of the weeklong meet in Singapore. Ledecky, the most decorated female swimmer in history, is bidding for an unprecedented seventh world title at the distance she has dominated since 2013. McIntosh, just 18, is the only swimmer to have beaten her at 800m in the past 15 years.