2013LCNationalsDana Vollmer places first in the prelims of the 100 butterfly.
Courtesy of: Peter H. Bick

INDIANAPOLIS, Indiana, June 27. CAL Aquatics' Dana Vollmer knows there's still work to be done to defend her world championship title, but for now she's happy to have the opportunity to defend that title after winning the 100 fly at the 2013 USA Swimming nationals.