<page_title> Katie Ledecky </page_title> <section_title> World records </section_title> <table> <cell> 400 m freestyle <col_header> Event </col_header> </cell> <cell> 3:58.86 <col_header> Time </col_header> </cell> </table>
In the 400-meter freestyle, Ledecky set a world record in a time of 3:58.86.