Stadium: Court 1F Round: 25
| ITF Women Waco | 2017/11/07 20:55 | Kostova, Elitsa v Gibbs, Nicole | 2-6,5-7 |
| ITF Women Tyler | 2017/11/03 16:00 | Kostova, Elitsa v Ahn, Kristie | 6-4,4-6,2-6 |
| ITF Women Tyler | 2017/11/02 15:00 | Victoria Duval v Kostova, Elitsa | 4-6,7-5,5-7 |
| ITF Women Tyler | 2017/10/31 16:30 | Kostova, Elitsa v Usue Maitane Arconada | 7-6,6-1 |
| ITF Women Macon | 2017/10/24 16:55 | Kostova, Elitsa v Jamie Loeb | 2-6,2-6 |
| Obidos, Singles W-WITF-POR-12A | 2017/10/11 11:30 | Berfu Cengiz v Kostova, Elitsa | 3-6,6-3,6-2 |
| Templeton, Singles W-WITF-USA-32A | 2017/09/29 20:40 | Jamie Loeb v Kostova, Elitsa | 6-2,6-4 |
| Templeton, Singles W-WITF-USA-32A | 2017/09/28 19:45 | Kostova, Elitsa v Kleybanova, Alisa | 6-4,3-6,6-2 |