Tancock defends world swimming crown

Great Britain's Liam Tancock wins gold in the 50m backstroke at the World Swimming Championships in Shanghai, beating Frenchman Camille Lacourt into second.

World record holder Tancock was defending the title he won in Rome two years ago and finished in a time of 24.50 seconds.

Gerhard Zandberg of South Africa claimed the bronze in 24.66.

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