Stadium: Court 2 Round: 26 Ground: Clay
| ITF Women Prokuplje | 2018/07/11 09:00 | Kiara Cvetkovic v Katarina Kostic | 2-6,6-2,2-6 |
| ITF Women Prokuplje Qual | 2018/07/09 07:00 | Costanza Traversi v Katarina Kostic | 4-6,3-6 |
| ITF Women Prokuplje Qual | 2018/06/30 07:00 | Katarina Kostic v Andrijana Stoilkovic | 2-6,2-6 |
| ITF Women Maribor | 2018/06/13 08:00 | Nina Alibalic v Katarina Kostic | 7-5,6-3 |
| ITF Women Maribor Qual | 2018/06/11 08:40 | Katarina Kostic v Emily Morton | 6-2,6-2 |
| ITF Women Maribor Qual | 2018/06/10 11:35 | Taro Keens v Katarina Kostic | 2-6,1-6 |
| ITF Women Maribor Qual | 2018/06/09 07:30 | Ayline Esina Samardzic v Katarina Kostic | 5-7,2-6 |
| ITF Women Banja Luka Qual | 2018/06/02 14:00 | Katarina Kostic v Romana Cisovska | 5-7,3-6 |
| ITF Women Prokuplje | 2018/07/11 07:00 | Andrijana Stoilkovic v Barbara Bonic | 3-6,3-6 |
| ITF Women Prokuplje | 2018/07/04 07:00 | Veronika Erjavec v Barbara Bonic | 6-2,6-4 |
| ITF Women Nis | 2018/05/31 08:40 | Barbara Bonic v Masa Jovanovic | 6-2,6-2 |
| ITF Women Nis | 2018/05/29 10:30 | Elena Milovanovic v Barbara Bonic | 1-6,1-6 |
| ITF Women Tbilisi Qual | 2018/04/30 08:35 | Barbara Bonic v Elysia Bolton | 3-6,2-6 |
| ITF Women Tbilisi Qual | 2018/04/29 08:00 | Barbara Bonic v Marina Davtyan | 6-1,3-6,7-5 |
| ITF Women Sharm El Sheikh | 2018/04/18 13:05 | Marlies Szupper v Barbara Bonic | 6-3,6-7,6-1 |
| ITF Women Sharm El Sheikh | 2018/04/12 10:05 | Barbara Bonic v Iryna Shymanovich | 1-6,4-6 |