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Dana Vollmer of the U.S. reacts after winning the women's 100m butterfly final during the London 2012 Olympic Games at the Aquatics Centre July 29, 2012. Vollmer set a world record with a timing of 55.98 seconds.

Japan's Ryosuke Irie jumps into the water to start his men's 100m backstroke heat during the London 2012 Olympic Games at the Aquatics Centre July 29, 2012.

Ethiene Cristina Gonser Franco of Brazil (C) prays whilst teammate Harumy Mariko de Freitas performs on the balance beam during the women's gymnastics qualification at the North Greenwich Arena during the London 2012 Olympic Games July 29, 2012.

China's Deng Linlin performs on the uneven bars during the women's gymnastics qualification at the North Greenwich Arena during the London 2012 Olympic Games July 29, 2012.

Gabrielle Douglas of the U.S. performs on the balance beam during the women's gymnastics qualification at the North Greenwich Arena during the London 2012 Olympic Games July 29, 2012.

Netherlands' Marianne Vos (L) reacts as she crosses the finish line ahead of Britain's Elizabeth Armitstead to win the women's cycling road race final at the London 2012 Olympic Games July 29, 2012.

South Korea's Na Ah-reum signs in for the women's cycling road race final at the London 2012 Olympic Games July 29, 2012.

South Korea's Choi Hyeonju fires an arrow in the women's archery team gold medal match at the Lords Cricket Ground during the London 2012 Olympic Games July 29, 2012. REUTERS/Suhaib Salem (BRITAIN - Tags: SPORT OLYMPICS SPORT ARCHERY)

China's Fang Yuting takes aim in the women's archery team gold medal match at the Lords Cricket Ground during the London 2012 Olympic Games July 29, 2012.

Italy's Diego Occhiuzzi reacts defeating his compatriot Aldo Montano (not seen) during their men's sabre individual round of 16 fencing competition at the ExCel venue at the London 2012 Olympic Games July 29, 2012

North Korea's An Kum Ae celebrates after defeating Cuba's Yanet Bermoy Acosta in their women's -52kg final judo match at the London 2012 Olympic Games July 29, 2012.

Indonesia's Jadi Setiadi prepares to lift on the 56Kg Group B weightlifting competition at the London 2012 Olympic Games July 29, 2012.