Dana Vollmer of US sets world record in 100-meter fly
NBC Sports: Dana Vollmer gave the US its second gold medal of the London Olympics Sunday with a win in the women’s 100-meter butterfly.
Vollmer also set a world record with a time of 55.98 seconds.
"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."