Stadium: C Round: 29 Ground: Clay
| ITF Poland F7 | 2018/08/18 10:00 | Thiago Seyboth Wild v Jahn, Jeremy | 5-7,6-7 |
| ITF Poland F7 | 2018/08/17 10:30 | Jahn, Jeremy v Lindell, Christian | 6-1,6-4 |
| ITF Poland F7 | 2018/08/16 10:45 | Jahn, Jeremy v Dischinger, Eduardo | 6-4,6-3 |
| ITF Poland F7 | 2018/08/15 12:00 | Jahn, Jeremy v Shcherba, Vitalii | 6-1,6-0 |
| Challenger Scheveningen | 2018/07/16 16:30 | Kamke, Tobias v Jahn, Jeremy | 6-4,3-6,7-6 |
| Challenger Scheveningen Qual | 2018/07/16 11:30 | Jahn, Jeremy v Kimmer Coppejans | 6-7,5-7 |
| Challenger Scheveningen Qual | 2018/07/15 11:55 | Jahn, Jeremy v Niels Lootsma | 7-6,4-6,7-5 |
| Challenger Scheveningen Qual | 2018/07/14 15:15 | Jahn, Jeremy v Dan Added | 6-1,6-2 |
| ITF Poland F7 | 2018/08/18 12:55 | Pedro Sakamoto v Lukas Klein | 6-2,6-2 |
| ITF Poland F7 | 2018/08/17 12:40 | Pedro Sakamoto v Pawel Juszczak | 6-1,6-4 |
| ITF Poland F7 | 2018/08/15 09:15 | Pedro Sakamoto v Kacper Zuk | 6-2,6-2 |
| ITF Poland F7 | 2018/08/14 12:00 | Pedro Sakamoto v Smola, Maciej | 7-6,7-6 |
| ITF Italy F22 | 2018/08/08 11:05 | Pedro Sakamoto v Reboul, Fabien | 4-6,4-6 |
| ITF Italy F22 | 2018/08/07 08:00 | Turchetti, Nicolo v Pedro Sakamoto | 4-6,3-6 |
| Challenger Tampere | 2018/07/21 09:25 | Pedro Sakamoto v Viktor Durasovic | 6-4,5-7,3-6 |
| Germany F8, Singles | 2018/07/17 15:45 | Pedro Sakamoto v Lenz, Julian | 5-7,1-6 |