LONDON (AP) -- Dana Vollmer won a gold medal at the Olympics and set a world record, too.
Not bad for someone who didn't even qualify four years ago.
On a night featuring a relay duel between the Australians and the Americans, Vollmer got things started with a bang Sunday in the 100-meter butterfly. She was third at the turn but powered to the wall for a time of 55.98 seconds, beating the record of 56.06 set by Sweden's Sarah Sjostrom in a since-banned high-tech bodysuit at the 2009 world championships.
The American dropped back her head when saw the time, then broke into a huge smile, slapped the water and pumped her fists.
"I'm on top of the world right now." she said. "I still know I can go faster."