Stadium: Pista 6 Round: 25 Ground: Hardcourt outdoor
| ITF W25 Denain | 2019/07/03 10:00 | Ganna Poznikhirenko v Elitsa Kostova | 3-6,3-6 |
| ITF W25 Trnava | 2019/02/06 11:45 | Elitsa Kostova v Ganna Poznikhirenko | 6-2,6-1 |
| ITF W25 Madrid | 2021/06/08 07:10 | Ganna Poznikhirenko v Judith P Saavedra | 6-1,6-2 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/04 09:30 | Berta M Avante v Ganna Poznikhirenko | 2-6,3-6 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/03 12:30 | Zoe Richard v Ganna Poznikhirenko | 3-6,3-5 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/02 11:00 | Valeria Koussenkova v Ganna Poznikhirenko | 1-6,1-6 |
| UTR Pro Tennis Series Barcelona Women | 2021/05/31 12:30 | Darja Semenistaja v Ganna Poznikhirenko | 6-3,6-2 |
| ITF W25 Salinas | 2021/05/12 16:15 | Haruna Arakawa v Ganna Poznikhirenko | 6-4,6-2 |
| ITF W25 Salinas | 2021/05/11 16:15 | Ganna Poznikhirenko v Celia Cervino Ruiz | 6-4,7-5 |
| ITF W25 Salinas | 2021/05/10 14:55 | Ganna Poznikhirenko v Marian G P Cano | 6-3,6-3 |
| French Open Women | 2021/05/26 08:30 | Elitsa Kostova v Ekaterine Gorgodze | 6-7,3-6 |
| French Open Women | 2021/05/24 08:30 | Salma Djoubri v Elitsa Kostova | 3-6,2-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/16 08:00 | Elitsa Kostova v Darja Semenistaja | 6-1,6-3 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/15 07:30 | Elitsa Kostova v Julia Terziyska | 6-4,5-1 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/14 10:30 | Daria Shalamanova v Elitsa Kostova | 2-6,3-5 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/13 09:00 | Bojana Marinkovic v Elitsa Kostova | 5-7,3-5 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/11 10:00 | Mirela Shkumbova v Elitsa Kostova | 0-6,1-6 |
| UTR Pro Tennis Series Pazardzhik Women | 2021/05/10 11:30 | Elitsa Kostova v Elena Trencheva | 6-0,5-1 |