Missy Franklin of the United States competes during the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. (Xinhua/Xie Haining)

Emily Seebohm of Australia reacts during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Emily Seebohm won the silver with 59.06 seconds. (Xinhua/Xie Haining)

Missy Franklin of the United Statas competes during the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. (Xinhua/Xie Haining)

Emily Seebohm of Australia competes during the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Emily Seebohm won the silver with 59.06 seconds. (Xinhua/Xie Haining)

Missy Franklin (C) of the United States, Emily Seebohm (L) of Australia and Terakawa Aya of Japan pose for group photos during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. Emily Seebohm and Terakawa Aya won the silver and the bronze with 59.06 and 59.23 seconds respectively. (Xinhua/Xie Haining)

Emily Seebohm of Australia competes during the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Emily Seebohm won the silver with 59.06 seconds. (Xinhua/Xie Haining)

Missy Franklin (R) of the United Statas hugs with another competitor after the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. (Xinhua/Xie Haining)

Terakawa Aya of Japan reacts during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Terakawa Aya won the bronze with 59.23 seconds. (Xinhua/Xie Haining)

Missy Franklin of the United Statas reacts during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. (Xinhua/Xie Haining)

Missy Franklin of the United Statas reacts during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. (Xinhua/Xie Haining)

Missy Franklin (C) of the United States, Emily Seebohm (L) of Australia and Terakawa Aya of Japan pose for group photos during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. Emily Seebohm and Terakawa Aya won the silver and the bronze with 59.06 and 59.23 seconds respectively. (Xinhua/Wang Lili)

Missy Franklin of the United Statas reacts during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Missy Franklin won the gold with 58.42 seconds. (Xinhua/Xie Haining)

Terakawa Aya of Japan reacts during the awarding ceremony of the women's 100m backstroke final of the swimming competition at the 15th FINA World Championships in Barcelona, Spain on July 30, 2013. Terakawa Aya won the bronze with 59.23 seconds. (Xinhua/Xie Haining)