Wang Jianjiahe of China competes during Women's 800m freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Wang Jianjiahe claimed the title with 8:04.35. (Xinhua/Wang Lili)

　　Wang Jianjiahe of China reacts before Women's 800m freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Wang Jianjiahe claimed the title with 8:04.35. (Xinhua/Wang Lili)

　　Wang Jianjiahe of China competes during Women's 800m freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Wang Jianjiahe claimed the title with 8:04.35. (Xinhua/Wang Lili)

　　Wang Jianjiahe of China celebrates after Women's 800m freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Wang Jianjiahe claimed the title with 8:04.35. (Xinhua/Wang Lili)

　　Wang Jianjiahe of China competes during Women's 800m freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Wang Jianjiahe claimed the title with 8:04.35. (Xinhua/Wang Lili)

　　Wang Jianjiahe of China is interviewd after Women's 800m freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Wang Jianjiahe claimed the title with 8:04.35. (Xinhua/Wang Lili)

　　Kirill Prigoda of Russia celebrates after Men's 200m Breaststroke Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Kirill Prigoda claimed the title with a new world record of 2:00.16. (Xinhua/Wang Lili)

　　Kirill Prigoda of Russia celebrates during the awarding ceremony of Men's 200m Breaststroke Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Kirill Prigoda claimed the title with a new world record of 2:00.16. (Xinhua/Huang Zongzhi)

　　Ranomi Kromowidjojo of the Netherlands competes during Women's 100m Freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Ranomi Kromowidjojo claimed the title with 51.14 seconds. (Xinhua/Wang Lili)

　　Gold medalist Kirill Prigoda (C) of Russia pose with Silver Medalist Qin Haiyang (L) of China and Bronze medalist Marco Koch of Germany during the awarding ceremony of Men's 200m Breaststroke Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Kirill Prigoda claimed the title with a new world record of 2:00.16. (Xinhua/Huang Zongzhi)

　　Chad le Clos (R) of South Africa celebrates after Men's 100m Butterfly Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 13, 2018. Chad le Clos claimed the title with 48.50 seconds. (Xinhua/Wang Lili)