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Missy Franklin of the USA (L) and Emily Seebohm of Australia (C) compete in the Swimming Women's 100m Backstroke Final on day eleven of the 15th FINA World Championships at Palau Sant Jordi on July 30, 2013 in Barcelona, Spain. (Photo by Clive Rose/Getty Images) ( 175048375 )

US swimmer Missy Franklin smiles before the final of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. JOSEP LAGO/AFP/Getty Images ( 521756286 )

US swimmer Missy Franklin (C) competes in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. JOSEP LAGO/AFP/Getty Images ( 521755985 )

Missy Franklin of the U.S. (C), Australia's Emily Seebohm (bottom) and Elizabeth Pelton of the U.S. start the women's 100m backstroke final during the World Swimming Championships at the Sant Jordi arena in Barcelona July 30, 2013. REUTERS/Albert Gea ( SWIMMING-WORLD/ )

Missy Franklin of the United States starts on her way to winning the gold medal in the Women's 100m backstroke final at the FINA Swimming World Championships in Barcelona, Spain, Tuesday, July 30, 2013. (AP Photo/Michael Sohn) ( Spain Swimming Worlds )

US swimmer Missy Franklin competes in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. PIERRE-PHILIPPE MARCOU/AFP/Getty Images ( 521755640 )

US swimmer Missy Franklin competes in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. JOSEP LAGO/AFP/Getty Images ( 521756298 )

Missy Franklin of the United States swims to the gold medal in the Women's 100m backstroke final at the FINA Swimming World Championships in Barcelona, Spain, Tuesday, July 30, 2013. (AP Photo/David J. Phillip) ( APTOPIX Spain Swimming Worlds )

Winner US swimmer Missy Franklin (C) and second-placed Australia's Emily Seebohm (R) react at the end of the final of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. JOSEP LAGO/AFP/Getty Images ( 521755980 )

Missy Franklin of the United States smiles as she holds her gold medal after the presentation ceremony for the Women's 100m backstroke final at the FINA Swimming World Championships in Barcelona, Spain, Tuesday, July 30, 2013. (AP Photo/Manu Fernandez) ( Spain Swimming Worlds )

Gold medalist US swimmer Missy Franklin (C), silver medalist Australia's Emily Seebohm (L) and bronze medalist Japan's Aya Terakawa pose on the podium during the award ceremony of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. FABRICE COFFRINI/AFP/Getty Images ( 521756797 )

Missy Franklin of the United States, right, smiles as she holds her gold medal with Australia's Emily Seebohm, silver, after the presentation ceremony for the Women's 100m backstroke final at the FINA Swimming World Championships in Barcelona, Spain, Tuesday, July 30, 2013. (AP Photo/Manu Fernandez) ( Spain Swimming Worlds )

Gold medalist US swimmer Missy Franklin (C), silver medalist Australia's Emily Seebohm (L) and bronze medalist Japan's Aya Terakawa celebrate on the podium during the award ceremony of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. FABRICE COFFRINI/AFP/Getty Images ( 521756864 )

US swimmer Missy Franklin prepares to compete in the final of the women's 100-metre backstroke swimming event in the FINA World Championships at Palau Sant Jordi in Barcelona on July 30, 2013. PIERRE-PHILIPPE MARCOU/AFP/Getty Images ( 521756328 )