| UTR Pro Tennis Series Pazardzhik Women | 2021/05/09 08:30 | Elitsa Kostova v Simona Ogescu | 7-6,6-2 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/08 09:00 | Elitsa Kostova v Daria Shalamanova | 6-4,3-6,6-1 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/07 10:00 | Doroteja Petrovic v Elitsa Kostova | 1-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/06 10:00 | Mirela Shkumbova v Elitsa Kostova | 1-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/04 11:30 | Ralitsa Alexandrova v Elitsa Kostova | 2-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/03 08:30 | Elitsa Kostova v Ani Vangelova | 6-1,5-0 |
| ITF W60 Bellinzona | 2021/04/05 13:20 | Bianca Turati v Elitsa Kostova | 6-4,6-4 |
| ITF W25 Dubai | 2021/04/01 06:25 | Elitsa Kostova v Yuliya Hatouka | 2-6,5-7 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/08 06:00 | Nikol Ruseva v Elena Trencheva | 6-4,6-3 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/06 08:30 | Elena Trencheva v Yoanna Radulova | 4-6,7-6,0-5 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/05 13:30 | Elena Trencheva v Julia Terziyska | 2-6,1-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/04 10:00 | Elena Trencheva v Katerina Dimitrova | 3-6,0-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/03 07:00 | Elena Trencheva v Gebriela Mihaylova | 0-6,3-5 |
| ITF W15 Pazardzhik | 2020/10/26 11:00 | Elena Trencheva v Anja Draskovic | 4-6,5-7 |
| ITF Women Varna | 2020/09/07 11:30 | Elena Trencheva v Chantal Sauvant | 5-7,2-6 |
| ITF W15 Heraklion | 2020/03/08 08:30 | Elena Trencheva v Alice Viglianisi | 6-4,5-7,3-10 |