Margarita Mamun of Russia competes during the 34th Rhythmic Gymnastics World Championships on September 8, 2015 in Stuttgart, Germany.

Margarita Mamun of Russia competes during the 34th Rhythmic Gymnastics World Championships on September 8, 2015 in Stuttgart, Germany.

Jae Yeon Son of South Korea competes during the 34th Rhythmic Gymnastics World Championships on September 8, 2015 in Stuttgart, Germany.

Jae Yeon Son of South Korea competes during the 34th Rhythmic Gymnastics World Championships on September 8, 2015 in Stuttgart, Germany.

Aliya Mustafina of Russia performs during the women's beam final at the Gymnastics World Championships in Nanning, in China's southern Guangxi province on October 12, 2014. Mustafina won the bronze medal.(c)AFP/Greg BAKER ▼13Oct2014AFP|【写真特集】カメラがとらえた世界体操のワンシーン http://www.afpbb.com/articles/-/3028472

Aliya Mustafina of Russia performs during the women's beam final at the Gymnastics World Championships in Nanning, in China's southern Guangxi province on October 12, 2014. Mustafina won the bronze medal.(c)AFP/Greg BAKER ▼13Oct2014AFP|【写真特集】カメラがとらえた世界体操のワンシーン http://www.afpbb.com/articles/-/3028472

Gold medallist Aliya Mustafina of Russia competes on the balance beam during the apparatus final at the Artistic Gymnastics World Championships in Antwerp, Belgium on Sunday, Oct. 6, 2013.

Gold medallist Aliya Mustafina of Russia competes on the balance beam during the apparatus final at the Artistic Gymnastics World Championships in Antwerp, Belgium on Sunday, Oct. 6, 2013.

Sakura Hayakawa of Japan competes with hoop during the 34th Rhythmic Gymnastics World Championships 2015 on September 11, 2015 in Stuttgart, Germany.

Sakura Hayakawa of Japan competes with hoop during the 34th Rhythmic Gymnastics World Championships 2015 on September 11, 2015 in Stuttgart, Germany.

Laura Jung of Germany competes during the 34th Rhythmic Gymnastics World Championships on September 9, 2015 in Stuttgart, Germany.

Laura Jung of Germany competes during the 34th Rhythmic Gymnastics World Championships on September 9, 2015 in Stuttgart, Germany.

Cassandra Pettersson of Sweden competes during the 34th Rhythmic Gymnastics World Championships on September 9, 2015 in Stuttgart, Germany.

Cassandra Pettersson of Sweden competes during the 34th Rhythmic Gymnastics World Championships on September 9, 2015 in Stuttgart, Germany.

Salome Pazhava of Georgia competes during the 34th Rhythmic Gymnastics World Championships on September 8, 2015 in Stuttgart, Germany.

Salome Pazhava of Georgia competes during the 34th Rhythmic Gymnastics World Championships on September 8, 2015 in Stuttgart, Germany.

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