| 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 |
| 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 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/07 08:30 | Shalamanova, Daria v Luisa Meyer Auf Der Heide | 6-4,4-6,7-5 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/05 10:30 | Shalamanova, Daria v Iva Ivanova | 6-1,6-3 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/04 07:00 | Shalamanova, Daria v Gaspar-Ivan, Ioana | 7-6,6-2 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/03 11:30 | Silvia Maria Costache v Shalamanova, Daria | 0-6,1-5 |
| ITF - W15 Antalya | 2021/04/13 07:00 | Shalamanova, Daria v Cvetkovic, Tina | 2-6,3-6 |
| ITF - W15 Antalya | 2021/04/12 09:00 | Jenny Duerst v Shalamanova, Daria | 3-6,5-7 |
| ITF - W15 Antalya | 2021/04/06 07:00 | Ekaterina Shalimova v Shalamanova, Daria | 6-2,6-1 |
| ITF - W15 Antalya | 2021/04/05 07:00 | Shalamanova, Daria v Nicole Khirin | 2-6,6-1,10-5 |