Adelaide, May 22 (AP) Olympic gold medalist Ariarne Titmus has broken the women's 400-meter freestyle world record at the Australian swimming championships.

Titmus finished in 3 minutes, 56.40 seconds in Sunday night's final at the South Australian Aquatic Centre to improve on Katie Ledecky's previous mark of 3:56.46 that the American set at the 2016 Rio Olympics.

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Titmus also won gold in the the 200-meter freestyle at the Tokyo Games last year. (AP)

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