Chinese teenager Ye Shiwen won her second gold medal of London 2012 with
victory in the 200m individual medley.
The 16-year-old, who claimed
gold and a world record in the 400m medley,
clocked two minutes 7.57 seconds for a new Olympic best.
"Ye has a strong freestyle, it is her strength in the medleys. She is just able to power through. She had that in the tank in the closing stages."
Australia's Alicia Coutts won the silver medal in a time of 2:08.15, while Caitlin Leverenz, of the United States, got bronze in 2:08.95.
finished seventh in the final, clocking 2:11.29.
Ye produced a stunning freestyle leg to shave 0.18 seconds off the Olympic record she set in Monday's semi-final.
She was leading at halfway, but on the final turn she had slipped to third before a fantastic freestyle saw her hold off the strong challenge of Coutts.
the gold medallist in Beijing four years ago,
was fourth, while world record holder Ariana Kukors was fifth.
Ye has been the
subject of some controversy
after a US coach described her record-breaking performance in Saturday's 400m individual medley as "disturbing".
However, she returned a negative drugs test following that race and
British Olympics chief Lord Moynihan has since said she "deserves recognition for her talent".