Stadium: Court 1 Oberhaching Round: 25 Ground: Carpet indoor
| ITF Germany F14 | 2018/10/01 10:00 | Wiskandt, Max v 왈테르슈에이드-투키크, 니콜라스 | 7-6,7-6 |
| ITF Germany F14 | 2018/09/30 11:30 | 레우치, 비탈 플루린 v Wiskandt, Max | 5-7,4-6 |
| ITF Germany F14 | 2018/10/01 10:00 | Sieber, Marc v von Der Schulenburg, Henry | 6-1,6-2 |
| ITF Germany F14 | 2018/09/30 11:30 | Sieber, Marc v Nystroem, Patrick | 6-1,7-5 |
| Challenger Sibiu Qual | 2018/09/16 12:00 | 프룬자, 니콜라에 v Sieber, Marc | 6-4,6-3 |
| Challenger Seville | 2018/09/01 16:00 | Sieber, Marc v 자파타 미랄레스, 베르나베 | 6-7,3-6 |
| Challenger Mallorca | 2018/08/26 11:30 | 제발로스, 페데리코 v Sieber, Marc | 3-6,6-1,6-3 |
| Challenger Meerbusch | 2018/08/14 12:30 | Sieber, Marc v 태틀로트, 조한 세바스티엔 | 6-7,6-4,4-6 |
| Meerbusch, Germany, Qualifying | 2018/08/13 09:00 | 라마신, 트리스탄 v Sieber, Marc | 6-7,5-7 |
| Meerbusch, Germany, Qualifying | 2018/08/12 09:40 | Sieber, Marc v 오에츠바치, 아드리안 | 6-0,6-0 |