Kammala wannan jumla: Oleksiak zai yi gasa a tawagar 'yan wasan Kanada a gasar Olympics ta Rio 2016 a tsere biyar. Gasar ta fara ne a rana ta farko. A cikin zafi na
100 m butterfly, ta karya rikodin kasa da rikodin duniya na matasa tare da lokacin 56.73 a kan hanyar zuwa wasan kusa da na karshe. Oleksiak ya kuma kafa wasan karshe na tawagar 'yan mata 4 × 100 m tare da Taylor Ruck, Chantal van Landeghem, Sandrine Mainville, da Michelle Williams tare da na biyun kawai suna iyo a cikin zafi. A wasan karshe na gasar relay ta rike matsayi na uku a kan Amurka da Ostiraliya, inda ta lashe lambar yabo ta farko ta Olympics a cikin 'yan matan' yan mata a cikin shekaru 40. Bayan tseren, ɗan shekara 16, ya ce, "Babu wanda ya yi tsammanin wannan na Kanada ya shiga cikin gwagwarmaya, amma yanzu da muke nan, mutane za su yi mamakin abin da muke yi".