Canadian swimming phenom Summer McIntosh was unable to beat American star Katie Ledecky in the women's 800-metre freestyle at the world championships Saturday, ending her quest to win five individual gold medals in Singapore.

The American great sealed her 23rd world title and seventh gold in Singapore, edging out Lani Pallister and Summer McIntosh

Ledecky won with a time of 8:05.62, both a world championships record and the fourth fastest time in the history of the 800m free. Pallister wasn't far behind (8:05.98), with McIntosh claiming bronze (8:07.29).