Stadium: Centre Court Round: 25 Ground: Carpet indoor
| Challenger Poprad Tatry Qual | 2018/06/17 12:00 | Frank Dancevic v David Poljak | 6-4,1-6,6-4 |
| Challenger Poprad Tatry Qual | 2018/06/16 16:25 | Peter Goldsteiner v David Poljak | 0-6,7-6,4-6 |
| Challenger Prostejov Qual | 2018/06/03 14:20 | David Poljak v Evgeny Karlovskiy | 3-6,4-6 |
| Challenger Prostejov Qual | 2018/06/03 08:00 | David Poljak v Patrik Nema | 2-6,6-2,6-4 |
| ITF Poland F3 | 2018/05/18 10:00 | Marvin Netuschil v David Poljak | 6-1,6-0 |
| ITF Poland F3 | 2018/05/15 09:10 | Timur Kiyamov v David Poljak | 5-7,6-2,1-6 |
| ITF Poland F2 | 2018/05/07 11:00 | David Poljak v Luca Gelhardt | 4-6,2-6 |
| Challenger Ostrava Qual | 2018/04/28 10:05 | David Poljak v Patricio Heras | 3-6,3-6 |
| ITF Hungary F5 | 2018/06/18 12:30 | Marko Miladinovic v Fred Simonsson | 0-6,2-6 |
| ATP Geneva Qual | 2018/05/20 09:00 | Marko Miladinovic v Bernabe Zapata Miralles | 4-6,1-6 |
| ATP Geneva Qual | 2018/05/19 08:00 | Matteo Donati v Marko Miladinovic | 2-6,4-6 |
| ITF Turkey F17 | 2018/05/03 09:00 | Marko Miladinovic v Mate Delic | 6-3,6-7,0-6 |
| ITF Turkey F17 | 2018/05/02 09:10 | Mikhail Korovin v Marko Miladinovic | 0-6,2-6 |
| ITF Turkey F12 | 2018/04/01 07:30 | Cem Ilkel v Marko Miladinovic | 2-6,6-2,6-2 |
| ITF Turkey F12 | 2018/03/31 07:30 | Marko Miladinovic v Dimitar Kuzmanov | 5-7,6-3,6-2 |
| ITF Turkey F12 | 2018/03/30 08:35 | Marko Miladinovic v Sarp Agabigun | 6-1,6-4 |