Rubuta ci gaba ga wannan sakin layi - A yammacin rana ta shida, Dressel ya daidaita rikodin Olympic a cikin mita 100 na malam buɗe ido
tare da lokacin 50.39 a cikin prelims zafi. Wannan rikodin na farko na Olympics a cikin mita 100 na malam buɗe ido Dressel ya kafa ƙasa da sa'o'i tara bayan kafa rikodin Olympic a cikin mita 100 na 'yanci. A zagayen zagayen karshe na biyu na mita 100 na malam buɗe ido a rana ta bakwai, Dressel ya yi iyo 49.71 kuma ya karya rikodin wasannin Olympic na 50.31 wanda Kristóf Milák ya kafa a zagayen farko na zagayen karshe. Daga baya a rana ta bakwai, Dressel ya yi iyo da kashi uku cikin ɗari na biyu daga kafa sabon rikodin Olympic a cikin prelims na mita 50 mai kyauta tare da lokacinsa na 21.32 kuma ya ci gaba zuwa wasan kusa da na karshe a matsayin na farko.