Stadium: WSG Grandstand Round: 46 Ground: Clay
| Challenger Marburg Qual | 2017/07/02 10:20 | Sieber, Marc v Bachinger, Matthias | 2-6,7-6,3-6 |
| Challenger Marburg Qual | 2017/07/01 10:00 | Sieber, Marc v Naow, Amer | 6-1,6-2 |
| ITF Turkey F24 | 2017/06/25 08:00 | Sieber, Marc v Dimitar Kuzmanov | 3-6,6-2,1-6 |
| ITF Turkey F24 | 2017/06/24 07:00 | Sieber, Marc v Turchetti, Nicolo | 6-3,6-3 |
| ITF Turkey F24 | 2017/06/23 07:00 | Sieber, Marc v Haylaz, Muhammet | 6-0,6-3 |
| ITF Turkey F24 | 2017/06/22 07:00 | Sieber, Marc v Gabriel Donev | 6-2,6-1 |
| ITF Turkey F24 | 2017/06/20 07:00 | Sieber, Marc v Kahlke, Jannis | 6-4,6-1 |
| ITF Turkey F23 | 2017/06/17 07:00 | Hugo Dellien v Sieber, Marc | 6-3,6-1 |
| Meerbusch, Allemagne, Qualifications | 2017/08/12 14:35 | Lazarov, Alexandar v Crepaldi, Erik | 6-3,6-4 |
| ITF Romania F8 | 2017/08/04 07:45 | Lazarov, Alexandar v Dima, Dragos | 6-1,3-6,6-3 |
| ITF Romania F8 | 2017/08/03 11:00 | Lazarov, Alexandar v Antonescu, Vasile | 6-3,6-3 |
| ITF Romania F8 | 2017/08/01 08:50 | Lazarov, Alexandar v Gabi Adrian Boitan | 6-1,6-2 |
| ITF Romania F7 | 2017/07/28 11:25 | Hernan Casanova v Lazarov, Alexandar | 3-6,6-2,6-0 |
| ITF Romania F7 | 2017/07/27 07:00 | Lazarov, Alexandar v Craciun, Teodor-Dacian | 6-2,6-1 |
| ITF Romania F7 | 2017/07/26 12:40 | Lazarov, Alexandar v Bogdan Pavel | 6-4,6-3 |
| ITF Romania F7 | 2017/07/25 10:10 | Lazarov, Alexandar v Addison, Aaron | 6-4,6-3 |