Four years after settling for bronze, Sanya Richards-Ross won gold in the women's 400.

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Olympic bronze medallist Sanya Richards ran the fastest women's 400m of the year to win gold in 49 seconds.

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Olympic bronze medallist Sanya Richards of the United States - who faded in the final won by Briton Christine Ohuruogu in Beijing - won the women's 400m in an overdue season's best of 49.74 secs, with Jamaica's Shericka Williams, second in Beijing, off the pace in fourth.

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