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Tom Shields of the United States competes during the Men's 200m Butterfly Final of FINA/airweave Swimming World Cup Doha 2017 in Doha, capital of Qatar on Oct. 4, 2017. Tom Shields took the silver with 1:49.86. (Xinhua/Nikku)

Tom Shields of the United States competes during the Men's 200m Butterfly Final of FINA/airweave Swimming World Cup Doha 2017 in Doha, capital of Qatar on Oct. 4, 2017. Tom Shields took the silver with 1:49.86. (Xinhua/Nikku)