In pics: men's 50m Butterfly Final of 14th FINA World Swimming Championships

Nicholas Santos of Brazil celebrates after Men's 50m Butterfly Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 15, 2018. Nicholas Santos claimed the title with a new Championship Record of 21.81 seconds. (Xinhua/Wang Lili)