set a new 400m freestyle world record, breaking her arch-rival 's six-year stranglehold.
Titmus came home in 3:56.40 at the Australian swimming championships in on Sunday night, just six hundredths of a second faster than the world record Ledecky had set at the Rio in 2016 when she won in 3:56.46.
The American dominated the discipline until Titmus burst onto the scene last year, winning the 200m and 400m freestyle at the Olympics and claiming silver behind her rival in the 800m freestyle.
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