<prompt> Pedzisa mutsara unotevera: Manheru ezuva rechitanhatu, Dressel akabatanidza chinyorwa cheOlympic mu  <response>: 100 metres butterfly ine nguva ye50.39 mu prelims heats. Nhoroondo yokutanga iyi yeOlympic munhangemutange yemamita 100 achimhanya neshiri yakagadzwa naDressel maawa asingasviki mapfumbamwe pashure pokunge atanga nhangemutange yeOlympic munhangemutange yemamita 100 achimhanya akasununguka. Muchikamu chechipiri chemasemifinal chemamita 100 butterfly pazuva rechinomwe, Dressel akashambira 49.71 uye akaputsa rekodhi yeOlympic ye50.31 yakaiswa naKristóf Milák muchikamu chekutanga chemasemifinal. Gare gare pazuva rechinomwe, Dressel akahwina mazana matatu ezana remasekondi kubva pakuisa rekodhi nyowani yeOlympic mumakwikwi ekutanga emamita makumi mashanu akasununguka nenguva yake ye21.32 uye akapfuurira kuenda kuma semifainari akagara pekutanga. 