Olympics swimming: Rebecca Soni takes gold and world record

American Rebecca Soni beat her own world record as she won gold in the women's 200m breaststroke.

The 25-year-old clocked two minutes and 19.59 seconds to become the first swimmer to successfully defend an Olympic title at London 2012 and the first woman to break 2:20.00.

Japan's Satomi Suzuki took silver while Russia's Iuliia Efimova finished third.

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