China's gymnast Deng Linlin performs during the women' s beam final of the artistic gymnastics event of the London Olympic Games on August 7, 2012 at the 02 North Greenwich Arena in London. AFP PHOTO / EMMANUEL DUNAND

Switzerland's Anja Nyffeler and Pamela Fischer compete in the duets technical routine during the synchronised swimming competition at the London 2012 Olympic Games in London. (AFP photo / Martin Bureau)

A shot from the duets free routine final during the synchronised swimming competition at the London 2012 Olympic Games in London. (AFP photo / Martin Bureau)

Britain's Nick Dempsey (C) poses with his sons Thomas-Flynn (L) and Oscar (R) after he won silver in the men's RS:X sailing class at the London 2012 Olympic Games, in Weymouth. (AFP photo / Williams West)

(From left) Canada's Jessica Zelinka , Australia's Sally Pearson, Turkey's Nevin Yanit, US' Kellie Wells, US' Dawn Harper, Canada's Phylicia George and US' LoLo Jones compete in the women's 100m hurdles final at the athletics event during the London 2012 Olympic Games in London. Pearson won the gold medal. b(AFP photo / Olivier Morin)

Greece's Evangelia Platanioti and Despoina Solomou compete in the duets free routine final during the synchronised swimming competition at the London 2012 Olympic Games in London. (AFP photo / Francois Xavier Marit)

Jamaica's Veronica Campbell-Brown competes in the women's 200m semi-finals at the athletics event during the London 2012 Olympic Games in London. (AFP photo / Franck Fife)

US athlete Chelsea Hayes competes in the women's long jump qualifying rounds at the athletics event during the London 2012 Olympic Games in London. (AFP photo / Franck Fife)