18 / 50

Olympics Day 1 - Swimming

LONDON, ENGLAND - JULY 28: Dana Vollmer of the United States prepares for the start of the second semifinal heat of the Women's 100m Butterfly on Day 1 of the London 2012 Olympic Games at the Aquatics Centre on July 28, 2012 in London, England. (Photo by Adam Pretty/Getty Images)

U.S. swimmer Dana Vollmer

Dana

Vollmer won gold and broke a world record after completing the 100 butterfly at

the Aquatics Centre in London.