Dana Vollmer of the United States won the gold medal in the women's 100m butterfly final Sunday at the 2012 Summer Olympics in London. In the process, she set a world record with a time of 55.98 seconds, becoming the first woman ever to break the 56-second barrier in the event.
Lu Ying of China earned the silver medal at 56.87 seconds and Australia's Alicia Coutts took home the bronze with a time of 56.94 seconds. Sarah Sjostrom of Sweeden came in fourth at 57.17 seconds. She set the previous world record at 56.06 seconds in Italy in 2009.
American Claire Donahue was in second place at the turn, but she fell back to finish seventh. Vollmer pulled even off the push off from the wall before overtaking Donahue and Denmark's Jeanette Ottesen Gray.
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