India, Aug. 2 -- Katie Ledecky once again dominated the 800-meter freestyle event. The American swimmer clinched her seventh consecutive world title on Saturday in Singapore, holding off a strong charge from 17-year-old Canadian standout Summer McIntosh. According to NBC, Ledecky led for much of the race, but McIntosh narrowed the gap lap by lap. At the 700-meter mark, the Canadian briefly nosed ahead by just 0.14 seconds. It looked like the crown might be slipping-until Ledecky dug in.

By the final stretch, she had pulled back in front, holding off the teenager and sealing her place in history.

With Saturday's win, Ledecky now owns more world titles in a single event than any swimmer in history. Her seventh gold in the 800 free moves p...