Stadium: Court 3 Round: 25 Ground: Clay
| ITF Women Saint Malo | 2018/09/18 10:20 | Kostova, Elitsa v Cagla Buyukakcay | 6-7,4-6 |
| Biarritz, Simples W-WITF-FRA-17A | 2018/09/12 13:25 | Witthoeft, Carina v Kostova, Elitsa | 6-4,7-6 |
| ITF Women Zagreb | 2018/09/06 16:50 | Kostova, Elitsa v Tena Lukas | 6-1,2-6,3-6 |
| ITF Women Zagreb | 2018/09/05 16:15 | Kostova, Elitsa v Bukta, Agnes | 6-3,6-4 |
| ITF Women Budapest | 2018/08/28 09:00 | Raluca Georgiana Serban v Kostova, Elitsa | 6-2,7-5 |
| US Open Women | 2018/08/21 16:15 | Kostova, Elitsa v Fiona Ferro | 1-6,7-5,4-6 |
| Prague, Singles W-WITF-CZE-06A | 2018/07/27 10:40 | Kostova, Elitsa v Hogenkamp, Richel | 6-7,7-6,2-6 |
| Prague, Singles W-WITF-CZE-06A | 2018/07/26 13:10 | Kostova, Elitsa v Lucrezia Stefanini | 6-2,6-4 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/24 12:00 | Jule Niemeier v Carolina Alves | 7-6,4-6,6-4 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/23 16:30 | Jule Niemeier v Cao, Siqi | 6-4,6-1 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/21 10:00 | Kucova, Kristina v Jule Niemeier | 6-2,6-2 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/19 12:00 | Jule Niemeier v Chiara Scholl | 6-1,6-1 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/17 15:40 | Jule Niemeier v Kennel, Karin | 6-2,6-4 |
| Santa Margherita Di Pula, Simples W-WITF-ITA-27A | 2018/09/16 15:45 | Jule Niemeier v Alessandra Crump | 6-1,6-3 |
| ITF Women Braunschweig | 2018/08/26 09:00 | Jule Niemeier v Zarycka, Anastatsia | 1-6,3-6 |
| ITF Women Braunschweig | 2018/08/25 14:45 | Jule Niemeier v Arn, Greta | 0-6,6-0,7-6 |