Stadium: Court 3 Round: 54 Ground: Clay
| ITF W15 Banja Luka | 2019/06/03 09:30 | Elena Milovanovic v Kostic, Katarina | 6-1,6-0 |
| ITF W15 Tucepi | 2019/05/07 07:00 | Pavkovic, Marina v Kostic, Katarina | 6-4,6-3 |
| ITF Women Szekesfehervar | 2018/09/02 08:00 | Malatinska, Justyna v Kostic, Katarina | 6-2,3-6,6-4 |
| ITF Women Vrnjacka Banja | 2018/08/19 10:00 | Kostic, Katarina v Zupancic, Nika | 3-6,6-4,2-6 |
| Prokuplje, Singles W-WITF-SRB-02A | 2018/07/12 08:40 | Kostic, Katarina v Bonic, Barbara | 0-6,4-6 |
| Prokuplje, Singles W-WITF-SRB-02A | 2018/07/11 09:00 | Kiara Cvetkovic v Kostic, Katarina | 2-6,6-2,2-6 |
| ITF Women Prokuplje Qual | 2018/07/09 07:00 | Costanza Traversi v Kostic, Katarina | 4-6,3-6 |
| ITF Women Prokuplje Qual | 2018/06/30 07:00 | Kostic, Katarina v Stoilkovic, Andrijana | 2-6,2-6 |
| ITF W15 Prokuplje | 2019/07/04 10:15 | Seone Mendez v Szlavikovics, Szabina | 6-0,6-3 |
| ITF W15 Prokuplje | 2019/07/03 07:00 | Szlavikovics, Szabina v Mesochoritou, Galateia | 6-3,4-6,6-2 |
| ITF W15 Prokuplje | 2019/07/02 08:00 | Novak, Kristina v Szlavikovics, Szabina | 4-6,3-6 |
| ITF W15 Prokuplje | 2019/07/01 07:00 | Szlavikovics, Szabina v Ekaterina Ovcharenko | 7-6,6-3 |
| Tabarka, Singles W-ITF-TUN-18A | 2019/05/23 10:45 | Szlavikovics, Szabina v Lutzeier, Lena | 6-7,4-6 |
| Tabarka, Singles W-ITF-TUN-18A | 2019/05/22 11:55 | Szlavikovics, Szabina v Stojanovic, Jelena | 6-2,6-2 |
| Tabarka, Singles W-ITF-TUN-18A | 2019/05/20 14:00 | La Cerra, Syria v Szlavikovics, Szabina | 0-6,0-6 |
| Tabarka, Singles W-ITF-TUN-18A | 2019/05/20 08:00 | Garcia Portero, Natalia v Szlavikovics, Szabina | 0-6,2-6 |