Updated on
Summary Dana Vollmer of the United States set a world record to win 100-metre butterfly at London Olympics.
Vollmer was third at the turn and hit the wall in 55.98 seconds to shave 0.08 off the previous mark set by Sarah Sjostrom of Sweden at the 2009 world championships in Rome.Vollmer had set an Olympic record in Saturday mornings heats. She missed qualifying for the 2008 Beijing Games.Lu Ying of China touched second in 56.87 and Alicia Coutts of Australia finished third in 56.94. Sjostrom was fourth.
