The reigning world record holder in both the 100- and 200-meter breaststroke, Soni is one of the top American female swimmers. In London, she will attempt to defend her Olympic gold medal in the 200 and improve upon her 100 silver from Beijing. She will also swim the breaststroke leg of the 4x100 medley relay.
Text: Kevin Fixler, SI.com
Photo: Al Bello/Getty Images