| ITF W60 Les Franqueses | 05/01 11:55 | 25 | Elitsa Kostova v Ivana Popovic | 6-1,6-3 | |
| WTA Anning | 04/23 05:55 | 25 | [42] Shuai Zhang v Elitsa Kostova [251] | 4-6,6-2,6-1 | |
| WTA Bogota | 04/08 19:50 | 25 | [227] Elitsa Kostova v Varvara Lepchenko [151] | 3-6,1-6 | |
| WTA Bogota | 04/07 18:25 | 64 | [162] Irina Bara v Elitsa Kostova [236] | 3-6,6-2,6-3 | |
| WTA Bogota | 04/06 19:10 | 45 | [236] Elitsa Kostova v Zoe Hives [202] | 6-7,7-5,6-0 | |
| ITF W80 Palm Harbor | 04/05 16:00 | 27 | [175] Danka Kovinic v Elitsa Kostova [236] | 7-6,3-6,6-2 | |
| ITF W80 Palm Harbor | 04/04 15:50 | 26 | [394] Michaela Honcova v Elitsa Kostova [236] | 2-6,5-7 | |
| ITF W80 Palm Harbor | 04/03 17:15 | 25 | Safiya Carrington v Elitsa Kostova | 0-6,3-6 | |
| ITF W25 Campinas | 03/29 13:00 | 27 | [217] Elitsa Kostova v Jessica Pieri [307] | 6-7,2-6 | |
| ITF W25 Campinas | 03/28 16:10 | 26 | [187] Barbara Haas v Elitsa Kostova [217] | 6-1,2-6,0-6 | |
| ITF W25 Campinas | 03/27 13:00 | 25 | [217] Elitsa Kostova v Maria Fernanda H Gonzalez [421] | 6-2,6-3 | |
| ITF W25 Curitiba | 03/21 13:00 | 26 | [217] Elitsa Kostova v Jasmine Paolini [215] | 2-6,6-4,2-6 | |
| ITF W25 Curitiba | 03/20 13:30 | 25 | Nathaly Kurata v Elitsa Kostova | 4-6,1-6 | |
| ITF W25 Macon | 02/26 12:00 | 25 | [220] Elitsa Kostova v Julie Gervais [416] | 4-6,4-6 | |
| ITF W25 Glasgow | 02/21 10:00 | 26 | [330] Nuria Parrizas-Diaz v Elitsa Kostova [220] | 6-2,7-6 | |
| ITF W25 Glasgow | 02/20 13:00 | 25 | Cristina Ene v Elitsa Kostova | 4-6,3-6 | |
| ITF W25 Trnava | 02/14 10:00 | 26 | [227] Elitsa Kostova v Tereza Martincová [153] | 3-6,6-7 | |
| ITF W25 Trnava | 02/12 12:50 | 25 | Romana Cisovska v Elitsa Kostova | 3-6,4-6 | |
| ITF W25 Trnava | 02/08 11:00 | 27 | [227] Elitsa Kostova v Lucie Hradecká [456] | 2-6,4-6 | |
| ITF W25 Trnava | 02/07 12:00 | 26 | [227] Elitsa Kostova v Yana Sizikova [355] | 6-3,6-2 | |
| ITF W25 Trnava | 02/06 11:45 | 25 | [227] Elitsa Kostova v Ganna Poznikhirenko [401] | 6-2,6-1 | |
| ITF W25 Singapore | 01/25 02:00 | 27 | [214] Elitsa Kostova v Lin Zhu [118] | 3-6,2-6 | |
| ITF W25 Singapore | 01/24 02:00 | 26 | Elitsa Kostova v Charmaine S Y Seah | 6-3,6-0 | |
| ITF W25 Singapore | 01/22 03:40 | 25 | [214] Elitsa Kostova v Naomi Broady [254] | 6-2,6-2 | |
| ITF W25 Singapore | 01/17 02:00 | 26 | Elitsa Kostova v Sabina Sharipova | 3-6,6-2,4-6 | |
| ITF W25 Singapore | 01/16 02:00 | 25 | Elitsa Kostova v Charmaine S Y Seah | 6-2,6-2 | |
| Australian Open - ženy | 01/08 03:10 | 44 | [215] Elitsa Kostova v Nicole Gibbs [127] | 4-6,2-6 | |
| ITF Women Las Vegas | 11/07 19:35 | 25 | [214] Elitsa Kostova v Fanni Stollar [127] | 3-6,3-6 | |
| ITF Women Toronto | 10/31 14:00 | 26 | [200] Elitsa Kostova v Kimberley Zimmermann [248] | 2-6,4-6 | |
| ITF Women Toronto | 10/30 15:45 | 25 | [200] Elitsa Kostova v Maja Chwalinska [335] | 7-5,4-6,6-3 |