Kammala wannan jumla: A rana ta huɗu, Dressel ya kasance na biyu a duka a cikin zafin jiki na farko na
100 mita freestyle tare da lokaci na 47.73 kuma ya ci gaba zuwa wasan kusa da na karshe. Washegari da safe na gasar, ya yi iyo a 47.23 a cikin zafinsa na karshe kuma ya ci gaba zuwa matsayi na biyu na ƙarshe don duka zafin zafin. Dressel ya lashe lambar zinare ta farko a gasar Olympics a wasan karshe na mita 100 na 'yanci tare da lokaci na 47.02, sabon rikodin Olympic. Dressel ya gama da kashi ɗari shida na biyu a gaban Kyle Chalmers na Australiya, wanda ya kasance canjin zakaran gasar Olympic daga Wasannin Olympics na bazara na 2016 inda Chalmers ya lashe lambar zinare kuma Dressel ya gama na shida a tseren mita 100.