World Athletics 2013: Perri Shakes-Drayton charges into 400m hurdles final

Britain's Perri Shakes-Drayton storms past defending champion Lashinda Demus to win her 400m hurdles semi-final at the World Athletics Championships in Moscow.

Shakes-Drayton won in 53.92 seconds, with Czech Republic's Zuzana Hejnova qualifying fastest overall from the two heats.

Fellow Brit Eilidh Child also qualified for the final which takes place on Thursday at 1745 BST.

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