In June 2015, 16-year-old Openysheva competed at the inaugural 2015 European Games in Baku, she won seven gold medals including in 200 m freestyle, 400 m freestyle, and helping the Russian Team win gold in 4 × 200 m freestyle, 4 × 100 m mixed medley, 4 × 100 m mixed freestyle, 4 × 100 m freestyle and in 4 × 100 m medley (together with Mariia Kameneva, Maria Astashkina, Polina Egorova broke a new junior world record touching in at 4:03.22). She won silver in 100 m freestyle behind Dutch Marrit Steenbergen. Openysheva was the most decorated athlete at the entire 2015 European Games.