On the last day of the prelims, Aksenova swam her two events with only an hour in between. First, she rounded out the top three swimmers in heat nine of the 50 m freestyle with a scorching 25.51, but finished only in twenty-eighth overall. One hour later, Aksenova and her teammates Anastasia Zuyeva, Yuliya Yefimova, and Natalya Sutyagina had entered the top eight final with a fifth-seeded time in 3:59.66, before keeping their position intact two days later. Handing the anchor duties on the final exchange, Aksenova fired off a freestyle split of 54.13 to give the Russian foursome a fifth-place time in a much-deserving 3:57.84.