The Jamaican ran 52.42 seconds to power home ahead of Lashinda Demus of the United States.

BBC: Walker storms to 400m hurdle gold

The double-medal performance in three events made Lashinda Demus' silver in the 400-meter hurdles seem like a disappointment.

WSJ: Menu

Commonwealth silver medallist Tasha Danvers-Smith was the best of the Brits as she came home fifth behind race-winner and world number one Lashinda Demus in the 400m hurdles.

BBC: SPORT | Athletics | Powell maintains unbeaten stretch