| UTR Pro Tennis Series Pazardzhik Women | 2021/05/06 10:00 | Shkumbova, Mirela v Kostova, Elitsa | 1-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/10 11:30 | Shkumbova, Mirela v Shalamanova, Daria | 4-6,3-5 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/08 11:00 | Yoanna Radulova v Shkumbova, Mirela | 3-6,4-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/07 13:30 | Shkumbova, Mirela v Ani Vangelova | 3-6,4-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/06 10:00 | Shkumbova, Mirela v Kostova, Elitsa | 1-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/05 12:00 | Ralitsa Alexandrova v Shkumbova, Mirela | 2-6,6-4,2-6 |
| ITF W15 Pazardzhik | 2020/10/28 11:00 | Vlada Ekshibarova v Shkumbova, Mirela | 7-5,6-4 |
| ITF W15 Pazardzhik | 2020/10/27 07:00 | Lucie Petruzelova v Shkumbova, Mirela | 4-6,6-2,5-10 |
| ITF W15 Pazardzhik | 2020/10/26 08:30 | Shkumbova, Mirela v Aleksandra Julia Zuchanska | 7-6,6-3 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/10 11:30 | Kostova, Elitsa v Trencheva, Elena | 6-0,5-1 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/09 08:30 | Kostova, Elitsa v Simona Ogescu | 7-6,6-2 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/08 09:00 | Kostova, Elitsa v Shalamanova, Daria | 6-4,3-6,6-1 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/07 10:00 | Doroteja Petrovic v Kostova, Elitsa | 1-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/06 10:00 | Shkumbova, Mirela v Kostova, Elitsa | 1-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/04 11:30 | Ralitsa Alexandrova v Kostova, Elitsa | 2-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/03 08:30 | Kostova, Elitsa v Ani Vangelova | 6-1,5-0 |
| ITF W60 Bellinzona | 2021/04/05 13:20 | Turati, Bianca v Kostova, Elitsa | 6-4,6-4 |