Nazarova competed for the Soviet Union at the 1987 World Championships in Rome, finishing eighth in the 400 metres final and winning a silver medal in the 4 × 400 m relay, with 400 m gold medallist
Olga Bryzgina,
Aelita Yurchenko and
Mariya Pinigina. She went on to compete for the Soviet Union at the
1988 Summer Olympics held in Seoul, winning the bronze medal in the 400 metres. She then joined with gold medalist Olga Bryzgina, 400 m hurdles silver medalist
Tatyana Ledovskaya and Mariya Pinigina to win gold in the 4 × 400 m relay. That USSR relay team set a new
world record of 3:15.17 minutes which is still unbeaten (). Nazarova competed only in the relay at the 1991 World Championships, winning a gold medal, along with Bryzgina, Ledovskaya and
Lyudmila Dzhigalova. She competed for the Commonwealth of Independent States at the
1992 Summer Olympics held in Barcelona, finishing fourth in the 400 m final. In the 4 × 400 metres, she won the gold medal, along with Bryzgina (who had this time won the silver medal in the 400 m), Dzhigalova and
Yelena Ruzina. ==International competitions==