Away History
| WTA Belgrade | 2021/07/27 14:50 | Elitsa Kostova v Arantxa Rus | 1-6,0-6 |
| ITF W60 Biarritz | 2021/07/14 09:30 | Elitsa Kostova v Estelle Cascino | 4-6,3-6 |
| ITF W100 Contrexeville | 2021/07/08 10:00 | Elitsa Kostova v Dalma Galfi | 6-7,1-6 |
| ITF W100 Contrexeville | 2021/07/06 11:45 | Ulrikke Eikeri v Elitsa Kostova | 4-6,6-3,4-6 |
| Wimbledon Women | 2021/06/24 10:00 | Elitsa Kostova v Xinyu Wang | 2-6,1-6 |
| Wimbledon Women | 2021/06/23 10:00 | Elitsa Kostova v Destanee Aiava | 6-4,7-5 |
| ITF W25 Madrid | 2021/06/11 07:15 | Robin Anderson v Elitsa Kostova | 7-6,6-2 |
| ITF W25 Madrid | 2021/06/10 10:35 | Yvonne Cavalle-Reimers v Elitsa Kostova | 6-3,2-6,5-7 |