Stadium: Campo 1 Round: 46 Ground: Clay
| Challenger Caltanissetta Qual | 2018/06/09 13:25 | Mikhail Balmashev v Marc Sieber | 0-6,1-6 |
| Challenger Prostejov Qual | 2018/06/03 15:25 | Marc Sieber v Jan Satral | 6-4,3-6,4-6 |
| Challenger Prostejov Qual | 2018/06/03 09:45 | Pavel Nejedly v Marc Sieber | 1-6,5-7 |
| ITF Hungary F2 | 2018/05/18 08:00 | Mate Valkusz v Marc Sieber | 6-1,6-1 |
| ITF Hungary F2 | 2018/05/17 14:55 | Emil Ruusuvuori v Marc Sieber | 2-6,3-6 |
| ITF Hungary F2 | 2018/05/16 10:10 | Gabor Borsos v Marc Sieber | 1-6,7-6,1-6 |
| ITF Hungary F2 | 2018/05/15 12:30 | David Szintai v Marc Sieber | 4-6,3-6 |
| ITF Hungary F1 | 2018/05/11 10:45 | Mate Valkusz v Marc Sieber | 6-2,6-2 |
| Challenger Caltanissetta Qual | 2018/06/09 14:15 | Volodymyr Uzhylovskyi v Pawel Juszczak | 3-6,2-6 |
| Challenger Poznań | 2018/06/05 12:00 | Pawel Juszczak v Victor Estrella Burgos | 3-6,6-1,4-6 |
| ITF Poland F4 | 2018/05/26 09:00 | Pawel Juszczak v Dante Gennaro | 2-6,6-3,4-6 |
| ITF Poland F4 | 2018/05/24 08:00 | Pawel Juszczak v Marek Semjan | 3-6,6-3,6-1 |
| ITF Poland F4 | 2018/05/22 08:55 | Pawel Juszczak v Piotr Grynkowski | 6-2,6-3 |
| ITF Poland F3 | 2018/05/21 09:00 | Sekou Bangoura v Pawel Juszczak | 4-6,7-5,6-4 |
| ITF Poland F3 | 2018/05/20 09:00 | Pavel Nejedly v Pawel Juszczak | 7-5,4-6,1-6 |
| ITF Poland F3 | 2018/05/19 13:05 | Dante Gennaro v Pawel Juszczak | 6-7,6-2,4-6 |