Stadium: Court 3 Oberhaching Round: 44 Ground: Carpet indoor
| Challenger Sibiu Qual | 2018/09/16 12:00 | Frunza, Nicolae v Sieber, Marc | 6-4,6-3 |
| Challenger Seville | 2018/09/01 16:00 | Sieber, Marc v Bernabe Zapata Miralles | 6-7,3-6 |
| Challenger Mallorca | 2018/08/26 11:30 | Federico Zeballos v Sieber, Marc | 3-6,6-1,6-3 |
| Challenger Meerbusch | 2018/08/14 12:30 | Sieber, Marc v Tatlot, Johan Sebastien | 6-7,6-4,4-6 |
| Meerbusch, Allemagne, Qualifications | 2018/08/13 09:00 | Tristan Lamasine v Sieber, Marc | 6-7,5-7 |
| Meerbusch, Allemagne, Qualifications | 2018/08/12 09:40 | Sieber, Marc v Adrian Oetzbach | 6-0,6-0 |
| Meerbusch, Allemagne, Qualifications | 2018/08/11 11:45 | Mats Rosenkranz v Sieber, Marc | 3-6,3-6 |
| Challenger Pullach Qual | 2018/08/04 09:00 | Sieber, Marc v Lenz, Julian | 4-6,6-4,4-6 |
| ITF Germany F14 | 2018/09/30 07:00 | Nystroem, Patrick v Vasic, Nikola | 6-0,6-2 |
| ITF Italy F26 | 2018/09/04 09:30 | Fred Simonsson v Nystroem, Patrick | 6-1,6-1 |
| ITF Italy F26 | 2018/09/02 11:00 | Nystroem, Patrick v Federico Marchetti | 6-2,2-6,7-5 |
| ITF Italy F26 | 2018/09/01 08:30 | Aichhorn, Jakob v Nystroem, Patrick | 2-6,4-6 |
| ITF Austria F6 | 2017/08/06 08:00 | Toby Martin v Nystroem, Patrick | 6-2,6-4 |
| ITF Austria F6 | 2017/08/05 10:00 | Nystroem, Patrick v Moncagatto, Francesco | 1-6,6-3,6-4 |
| ITF Austria F6 | 2017/08/05 07:00 | Nystroem, Patrick v Aaes, Ludvig | 6-3,6-1 |
| ITF Austria F3 | 2017/07/15 07:00 | Nystroem, Patrick v Remy Bertola | 6-3,6-7,2-6 |