Dana Vollmer set a new world record to win gold in the 100m butterfly final.
The American swimmer produced a stunning race to smash the previous world record and leave her rivals lagging behind.
Lu Ying took the silver for China nearly a second later, followed by Alicia Coutts, who claimed bronze for Australia.
Dana Vollmer sets world record in 100m butterfly final
By Liam Power, Reporter
Dana Vollmer wins the 100m butterfly final to win gold in a world record time.
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