The United States added to their medal count today and did it with swagger.

U.S. Swimmer Dana Vollmer set a new world record in the 100-meter butterfly at the 2012 Olympics in London. She didn’t even qualify for the event in 2008 for the games in Beijing.

Her time was 55.98 seconds, beating the 56.06 time set by Sweden’s Sarah Sjostrom during the 2009 World Championships. Sjostrom competed in this year’s event, but did not medal.

Lu Ying of China won the silver medal and Alicia Coutts of Australia took home the bronze.