Round: 27 Ground: Clay
| ITF Austria F2 | 2017/07/11 08:30 | Yvo Panak v Prechtel, Sebastian | 4-6,3-6 |
| Challenger Marburg Qual | 2017/07/01 10:45 | Ymer, Mikael v Prechtel, Sebastian | 6-1,0-6,7-6 |
| ITF Italy F19 | 2017/06/26 09:00 | Prechtel, Sebastian v Federico Iannaccone | 5-7,6-3,2-6 |
| ITF Italy F18 | 2017/06/23 15:00 | Prechtel, Sebastian v Frigerio, Lorenzo | 6-7,2-6 |
| ITF Italy F18 | 2017/06/22 10:00 | Prechtel, Sebastian v Marcelo Zormann | 6-3,7-6 |
| ITF Italy F18 | 2017/06/20 11:35 | Orlando Luz v Prechtel, Sebastian | 3-6,6-3,4-6 |
| ITF Italy F17 | 2017/06/13 18:30 | Andrea Collarini v Prechtel, Sebastian | 6-3,6-1 |
| ITF Italy F17 | 2017/06/11 09:00 | Prechtel, Sebastian v Mats Rosenkranz | 6-2,3-6,6-1 |
| ITF Austria F2 | 2017/07/12 10:40 | Jonas Trinker v Jahn, Jeremy | 3-6,4-6 |
| ITF Austria F2 | 2017/07/10 11:00 | Onishi, Ken v Jahn, Jeremy | 3-6,6-7 |
| Wimbledon Qual | 2017/06/26 11:30 | Jahn, Jeremy v Blake Mott | 4-6,4-6 |
| Challenger Todi | 2017/06/20 11:55 | Facundo Bagnis v Jahn, Jeremy | 6-4,0-6,7-5 |
| Challenger - Lyon | 2017/06/13 14:30 | Mathieu, Paul-Henri v Jahn, Jeremy | 6-3,6-1 |
| ITF Italy F15 | 2017/05/30 09:00 | Jahn, Jeremy v Andrea Collarini | 1-6,5-7 |
| ITF Sweden F2 | 2017/05/17 08:15 | Jonathan Mridha v Jahn, Jeremy | 1-6,7-6,7-6 |
| ITF Sweden F2 | 2017/05/16 09:35 | Karl Friberg v Jahn, Jeremy | 5-7,2-6 |