Ledecky sets 400m Freestyle world record
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Ledecky sets 400m Freestyle world record

The USA's Katie Ledecky remains untouchable throughout the women's 400m freestyle final, breaking her own world record and winning gold.

Ledecky sets 400m Freestyle world record

The USA's Katie Ledecky remains untouchable throughout the women's 400m freestyle final, breaking her own world record and winning gold.