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Ariarne Titmus's 400m world record smashed by Canadian teen Summer McIntosh

Summer McIntosh is one of swimming's greatest emerging talents. (Getty Images: Gregory Shamus/File)

Australian swimming superstar Ariarne Titmus has seen her 400 metre world record smashed by emerging Canadian star Summer McIntosh.

McIntosh obliterated the record by 0.32 seconds on the opening night of the Canadian swimming trials on Tuesday.

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