United States' Dana Vollmer competes in the women's 100-meter butterfly swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. Vollmer set a new world record with a time of 55.98 (AP Photo/Mark J. Terrill)
LONDON - Dana Vollmer of the United States set a world record to win the 100-metre butterfly at the London Olympics on Sunday.
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 morning's 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.
