Stadium: Court 2 Round: 25 Ground: Clay
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/25 17:15 | Kostova, Elitsa v Jule Niemeier | 7-5,6-1 |
| French Open Women | 2020/09/24 08:00 | Kostova, Elitsa v Niculescu, Monica | 0-6,7-6,3-6 |
| French Open Women | 2020/09/22 13:10 | Kostova, Elitsa v Gabriela Ce | 7-5,3-6,6-2 |
| ITF W60 Saint Malo | 2020/09/09 10:00 | Magdalena Frech v Kostova, Elitsa | 6-3,6-3 |
| WTA Prague | 2020/08/30 16:30 | Kostova, Elitsa v Di Giuseppe, Martina | 5-7,6-3,3-6 |
| UTR Pro Tennis Series France Women | 2020/08/17 07:05 | Arina Gabriela Vasilescu v Kostova, Elitsa | 3-6,1-6 |
| UTR Pro Tennis Series France Women | 2020/08/16 12:20 | Carole Monnet v Kostova, Elitsa | 6-4,6-3 |
| UTR Pro Tennis Series France Women | 2020/08/15 12:10 | Diana Marcinkevica v Kostova, Elitsa | 1-6,7-6,4-10 |
| UTR Pro Tennis Series France Women | 2020/08/14 07:00 | Yvonne Cavalle-Reimers v Kostova, Elitsa | 6-7,4-6 |
| ITF W25 Cherbourg | 2020/10/17 11:30 | Harriet Dart v Jule Niemeier | 6-4,6-4 |
| ITF W25 Cherbourg | 2020/10/16 10:40 | Garcia Perez, Georgina v Jule Niemeier | 3-6,5-7 |
| ITF W25 Cherbourg | 2020/10/15 13:10 | Jule Niemeier v Daniela Seguel | 6-4,5-7,6-2 |
| ITF W25 Cherbourg | 2020/10/14 10:30 | Carole Monnet v Jule Niemeier | 5-7,3-6 |
| ITF W25 Cherbourg | 2020/10/12 14:45 | Kathinka Von Deichmann v Jule Niemeier | 2-6,3-6 |
| ITF W25 Cherbourg | 2020/10/11 14:15 | Alice Robbe v Jule Niemeier | 3-6,0-6 |
| ITF W25 Porto | 2020/10/03 14:00 | Beatriz Haddad Maia v Jule Niemeier | 6-1,7-5 |
| ITF W25 Porto | 2020/10/01 15:35 | Jule Niemeier v Laura Pigossi | 7-5,6-3 |