Dee ihe ga-eso paragraf a - N'uhuruchi nke ụbọchị nke isii, Dressel jikọtara ihe ndekọ Olimpik n'ọsọ 100 mita butterfly
na oge nke 50.39 na prelims okpomọkụ. Ihe ndekọ Olympic mbụ a na 100 mita butterfly Dressel setịpụrụ ihe na-erughị awa itoolu mgbe o setịpụsịrị ihe ndekọ Olympic na 100 mita freestyle. Na agba nke abụọ nke ọkara nke 100 mita butterfly n'ụbọchị nke asaa, Dressel gbara ọsọ 49.71 wee mebie ndekọ Olympic nke 50.31 nke Kristóf Milák setịpụrụ na agba nke mbụ. Mgbe e mesịrị n'ụbọchị nke asaa, Dressel gbagara narị atọ nke sekọnd site n'ịtọlite ihe ndekọ ọhụrụ nke Olympic na prelims nke 50 mita freestyle na oge ya nke 21.32 wee banye na ọkara ikpeazu n'ọkwa mbụ.