| 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 |
| ITF Women Varna | 2020/09/08 07:30 | Ruseva, Nikol v Shkumbova, Mirela | 6-3,6-1 |
| ITF Women Varna | 2020/09/07 07:30 | Shkumbova, Mirela v Gvozdenovic, Sara | 6-3,7-5 |
| ITF W15 Sozopol | 2019/10/02 07:00 | Shkumbova, Mirela v Ani Vangelova | 0-6,6-7 |
| 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 |
| ITF W25 Dubai | 2021/04/01 06:25 | Kostova, Elitsa v Hatouka, Yuliya | 2-6,5-7 |
| ITF W25 Dubai | 2021/03/31 07:40 | Lesley Pattinama Kerkhove v Kostova, Elitsa | 2-6,5-7 |
| ITF W25 Dubai | 2021/03/30 10:50 | Kostova, Elitsa v Sharipova, Sabina | 6-4,4-6,6-1 |
| Open d'Australie - Femmes | 2021/01/10 12:55 | Lottner, Antonia v Kostova, Elitsa | 6-4,7-5 |
| ITF W25 LPD Gran Canaria | 2020/11/18 13:00 | Kostova, Elitsa v Jule Niemeier | 3-6,0-6 |