| UTR Pro Tennis Series Barcelona Women | 2021/11/04 11:30 | Kostova, Elitsa v Nina Ugrelidze | 4-6,6-1,6-0 |
| UTR Pro Tennis Series Barcelona Women | 2021/11/03 10:00 | Agustina Chlpac v Kostova, Elitsa | 3-6,0-6 |
| UTR Pro Tennis Series Barcelona Women | 2021/11/02 12:30 | Lucia Aranda Arcas v Kostova, Elitsa | 6-4,4-6,1-5 |
| WTA Belgrade | 2021/07/27 14:50 | Kostova, Elitsa v Arantxa Rus | 1-6,0-6 |
| ITF W60 Biarritz | 2021/07/14 09:30 | Kostova, Elitsa v Estelle Cascino | 4-6,3-6 |
| ITF W100 Contrexeville | 2021/07/08 10:00 | Kostova, Elitsa v Dalma Galfi | 6-7,1-6 |
| ITF W100 Contrexeville | 2021/07/06 11:45 | Ulrikke Eikeri v Kostova, Elitsa | 4-6,6-3,4-6 |
| Wimbledon Women | 2021/06/24 10:00 | Kostova, Elitsa v Xinyu Wang | 2-6,1-6 |
| UTR Pro Tennis Series Barcelona Women | 2021/11/04 11:30 | Agustina Chlpac v Valeria Avdeeva | 6-4,1-6,2-5 |
| UTR Pro Tennis Series Barcelona Women | 2021/11/03 10:00 | Lucia Aranda Arcas v Valeria Avdeeva | 6-3,5-7,6-4 |
| UTR Pro Tennis Series Barcelona Women | 2021/11/01 10:30 | Nina Ugrelidze v Valeria Avdeeva | 6-3,1-6,5-2 |
| UTR Pro Tennis Series Barcelona Women | 2021/10/31 09:30 | Valeria Avdeeva v Ciobanu, Daniela | 3-0 |
| UTR Pro Tennis Series Barcelona Women | 2021/10/30 16:30 | Agustina Chlpac v Valeria Avdeeva | 4-6,2-5 |
| UTR Pro Tennis Series Barcelona Women | 2021/10/29 07:00 | Valeria Avdeeva v Valeria Koussenkova | 4-6,6-3,6-2 |
| UTR Pro Tennis Series Barcelona Women | 2021/10/28 10:00 | Valeria Avdeeva v Krasnova, Daria | 6-7,1-6 |
| UTR Pro Tennis Series Barcelona Women | 2021/10/27 14:00 | Alogo Piqueras, Gloria v Valeria Avdeeva | 6-4,6-2 |