In the final event of the evening in Beijing, Jamaica's Melaine Walker won gold in the 400m hurdles in a new Olympic record of 52.64s.
Walker powered off the final hurdle to finish comfortably ahead of American Sheena Tosta with Great Britain's Natasha Danvers putting an injury-plagued season behind her to snatch bronze.
Danvers was almost caught on the line by the fast-finishing Anastasiya Rabchenyuk of Ukraine and waited for confirmation from the giant scoreboard that she had held on to set a new personal best of 53.84.
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