[1] Mateva first big competition was the 2008 Junior European Championship in Turin, where she performed with ribbon, ending 4th in the apparatus final.

[2] Mariya competed at the 2010 World Championship in Moscow, where she performed with rope and ribbon not advancing to any final and taking 7th place in the team competition.

[6] Mateva competed in three World Cup stages in 2015, Pesaro where she ending the All-Around in 19th,[7] Tashkent where she was 4th in the ball final,[8] and Lisbon finishing 6th with hoop and with clubs,[9] before the European Championship in Minsk where she didn't reach any final and was 10th with the team.

[10] She was then selected to compete at the 1st European Games in Baku along Neviana Vladinova, where she didn't reach finals and was 17th in the All-Around.

[12][13] Scoliosis, a curvature of the spine, lead to her being dropped from the Bulgarian squad in February 2016 by national coach Efrosina Angelova taking her by surprise and making it her official retirement from the sport.