In 2018, Selezneva participated for the first time at the 2018 Grand Prix Moscow, finishing eleventh in the all-around competition. At the 2018 Russian National Championships, Selezneva won the bronze medal in the all-around competition behind Dina Averina and Aleksandra Soldatova. She qualified in three apparatuses finals, and won gold with hoop, ball and clubs. At the 2018 Grand Prix Kiev, she won the gold medal in all-around with a total score of 72.350, ahead of Katrin Taseva and Maria Sergeeva. She qualified to all apparatuses finals and won gold with ball and ribbon and silver with hoop and clubs. At the 2018 Grand Prix Thiais, she won the silver medal in all-around, behind Dina Averina. She qualified in 2 apparatus finals winning bronze with hoop and silver with ribbon. Selezneva participated at the 2018 Sofia World Cup, finishing with a silver medal in the all-around competition, behind teammate Aleksandra Soldatova. At the events finals, she won a silver with ball and a bronze with ribbon; she finished 7th with hoop and 5th with clubs. On April 20–22, at the 2018 Tashkent World Cup, Selezneva won bronze in the all-around, she qualified in all apparatus finals: she won two bronze with ball, ribbon, placed 4th in hoop and 5th in clubs. On April 27–29, Selezneva then competed in a World Challenge Cup event at the 2018 Baku World Cup where she won finished 11th in the all-around after a disastrous clubs and ribbon routine, she qualified in 1 apparatus winning the gold in hoop ahead of teammate Maria Sergeeva. On May 16–17, Selezneva competed at the 2018 Holon Grand Prix and won the all-around bronze medal with a total of 72.050 points, she qualified in 2 apparatus: ball and ribbon, however she took the placement qualification of Soldatova in hoop and clubs after she withdrew from competition in the event finals, Selezneva won silver in ribbon, bronze in clubs and finished 4th in hoop, ball.