Stadium: Court 2 Round: 26 Ground: Clay
| ITF Serbia F3 | 2018/08/21 08:00 | Darko Bojanovic v Ondrej Krstev | 7-6,1-6,3-6 |
| ITF Slovakia F3 | 2018/08/07 11:55 | Antonio Massara v Ondrej Krstev | 6-3,6-2 |
| ITF Slovakia F2 | 2018/08/01 08:00 | Patrik Nema v Ondrej Krstev | 6-4,2-6,6-4 |
| ITF Germany F9 | 2018/07/24 12:20 | Marcelo Zormann v Ondrej Krstev | 6-4,6-1 |
| ITF Czech Republic F6 Qual | 2018/07/07 13:30 | Ondrej Krstev v Michael Gloeckler | 3-6,1-6 |
| ITF Germany F4 | 2018/06/16 08:00 | Ondrej Krstev v James Markiewicz | 6-1,6-2 |
| ITF Czech Republic F2 | 2018/05/24 10:10 | Patrik Rikl v Ondrej Krstev | 6-1,6-4 |
| ITF Czech Republic F2 | 2018/05/22 08:00 | Ondrej Krstev v Kody Pearson | 2-6,7-5,6-3 |
| ITF Serbia F3 | 2018/08/21 08:00 | Lingxi Zhao v Dejan Katic | 1-6,3-6 |
| ITF Serbia F2 | 2018/08/16 11:25 | Dejan Katic v Simone Roncalli | 2-6,7-6,5-7 |
| ITF Serbia F2 | 2018/08/14 10:05 | Dejan Katic v Nemanja Subanovic | 6-1,6-7,6-4 |
| ITF Serbia F1 | 2018/08/08 09:50 | Dejan Katic v Andrea Picchione | 4-6,6-4,1-6 |
| ITF Ukraine F3 | 2018/05/22 10:45 | Oleg Dolgosheyev v Dejan Katic | 6-4,6-3 |
| ITF Ukraine F2 | 2018/05/15 10:55 | Nazar Achour v Dejan Katic | 6-3,6-4 |
| ITF Ukraine F1 | 2018/05/09 10:15 | Daniil Strelchenko v Dejan Katic | 1-6,6-7 |
| ITF Ukraine F1 | 2018/05/08 13:10 | Vitalii Shcherba v Dejan Katic | 7-5,3-6,6-7 |