Australian Titmus Sets WR in 400m Freestyle as Ledecky Settles for Silver

Ariarne Titmus poses during the medals ceremony in Fukuoka on July 23. 

Photographer: Manan Vatsyayana/AFP/Getty Images

FUKUOKA, Japan (AP) — Australian Ariarne Titmus had only one tactic in mind to reclaim her women's 400-meter freestyle world record on Sunday's opening day of the World Aquatics Championships.

Start fast and hang on.