| ITF W60 Warsaw | 08/08 09:00 | 26 | [285] Anastasiya Komardina v Elitsa Kostova [239] | 2-6,6-4,6-3 | |
| ITF W60 Warsaw | 08/07 08:00 | 25 | [361] Lucia Bronzetti v Elitsa Kostova [239] | 2-6,4-6 | |
| ITF W25 El Espinar | 08/03 12:10 | 28 | [238] Elitsa Kostova v Julia Terziyska [284] | 7-6,4-6,4-6 | |
| ITF W25 El Espinar | 08/02 09:25 | 27 | Olga Ianchuk v Elitsa Kostova | 0-6,3-6 | |
| ITF W25 El Espinar | 08/01 10:25 | 26 | [497] Ioana Loredana Rosca v Elitsa Kostova [238] | 3-6,6-4,5-7 | |
| ITF W25 El Espinar | 07/31 15:45 | 25 | Julieta Lara Estable v Elitsa Kostova | Retired | |
| ITF W80 Biarritz | 07/19 13:00 | 27 | [162] Veronica Cepede Royg v Elitsa Kostova [216] | 6-2,6-7,6-1 | |
| ITF W80 Biarritz | 07/18 10:35 | 26 | Sofia Shapatava v Elitsa Kostova | 4-6,1-6 | |
| ITF W80 Biarritz | 07/16 09:00 | 25 | [224] Fanni Stollar v Elitsa Kostova [216] | 3-6,1-6 | |
| ITF W60 Versmold | 07/11 15:00 | 26 | [188] Irina Maria Bara v Elitsa Kostova [220] | 4-6,6-3,6-0 | |
| ITF W60 Versmold | 07/10 12:00 | 25 | [319] Katharina Gerlach v Elitsa Kostova [220] | 3-6,5-7 | |
| ITF W25 Denain | 07/06 12:30 | 28 | [247] Katharina Hobgarski v Elitsa Kostova [220] | 6-1,6-3 | |
| ITF W25 Denain | 07/05 11:25 | 27 | [292] Valeriya Strakhova v Elitsa Kostova [220] | 3-6,4-6 | |
| ITF W25 Denain | 07/04 08:00 | 26 | Nathaly Kurata v Elitsa Kostova | 6-4,0-6,1-6 | |
| ITF W25 Denain | 07/03 10:00 | 25 | [400] Ganna Poznikhirenko v Elitsa Kostova [220] | 3-6,3-6 | |
| ITF W25 Montpellier | 06/20 13:00 | 26 | [242] Elitsa Kostova v Elizabeth Halbauer [311] | 1-6,4-6 | |
| ITF W25 Montpellier | 06/19 14:00 | 25 | [242] Elitsa Kostova v Eleonora Molinaro [491] | 7-6,6-3 | |
| ITF W25 Přerov | 06/16 08:00 | 29 | [145] Anhelina Kalinina v Elitsa Kostova [231] | 6-1,4-6,6-1 | |
| ITF W25 Přerov | 06/15 09:50 | 28 | Elitsa Kostova v Amanda Carreras | 6-2,6-3 | |
| ITF W25 Přerov | 06/14 11:35 | 27 | Elitsa Kostova v Kathinka Von Deichmann | 6-7,6-3,6-4 | |
| ITF W25 Přerov | 06/13 12:45 | 26 | Elitsa Kostova v Oksana Selekhmeteva | 6-2,7-6 | |
| ITF W25 Přerov | 06/12 10:10 | 25 | Elitsa Kostova v Nikola Tomanova | 7-5,7-5 | |
| ITF W25 SM de Montbui | 06/02 09:30 | 29 | [231] Arina Rodionova v Elitsa Kostova [271] | 5-7,3-6 | |
| ITF W25 SM de Montbui | 06/01 11:00 | 28 | [272] Nadia Podoroska v Elitsa Kostova [271] | 3-6,3-6 | |
| ITF W25 SM de Montbui | 05/31 13:45 | 27 | [271] Elitsa Kostova v Xiyu Wang [133] | 7-6,6-1 | |
| ITF W25 SM de Montbui | 05/30 10:15 | 26 | Elitsa Kostova v Lucia C Llorca | 6-0,6-1 | |
| ITF W25 SM de Montbui | 05/29 11:20 | 25 | [271] Elitsa Kostova v Andrea Gamiz [365] | 6-0,6-1 | |
| WTA Nurnberg | 05/18 14:05 | 45 | [273] Katharina Hobgarski v Elitsa Kostova [264] | 2-6,6-2,6-2 | |
| ITF W60 Les Franqueses | 05/04 08:00 | 27 | [254] Elitsa Kostova v Jodie Anna Burrage [297] | 3-6,2-6 | |
| ITF W60 Les Franqueses | 05/02 10:20 | 26 | [254] Elitsa Kostova v Eva Guerrero Alvarez [305] | 6-2,6-4 |