Stadium: Acqua Maniva Round: 24 Ground: Clay
| Challenger - Augsburg | 2019/08/06 12:50 | Jahn, Jeremy v Pedro Martinez | 5-7,6-4,6-7 |
| Challenger - Augsburg | 2019/08/05 14:05 | Javier Barranco Cosano v Jahn, Jeremy | 2-6,3-6 |
| Sopot, Pologne | 2019/08/01 14:10 | Jan Choinski v Jahn, Jeremy | 6-3,6-7,6-4 |
| Sopot, Pologne | 2019/07/31 12:00 | Jahn, Jeremy v Kamil Majchrzak | 6-7,6-1,7-5 |
| Sopot, Pologne | 2019/07/29 15:00 | Pedro Sakamoto v Jahn, Jeremy | 3-6,3-6 |
| Lasne, Singles Qualifying M-ITF-BEL-02A | 2019/07/07 12:30 | Vanneste, Jeroen v Jahn, Jeremy | 6-1,7-5 |
| Lasne, Singles Qualifying M-ITF-BEL-02A | 2019/07/06 12:00 | Jahn, Jeremy v Eriksson, Markus | 7-5,7-6 |
| Lasne, Singles Qualifying M-ITF-BEL-02A | 2019/07/05 13:00 | Zizou Bergs v Jahn, Jeremy | 6-4,2-6,6-7 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2019/08/07 08:00 | Fajing Sun v Pospisil, Jaroslav | 2-6,6-7 |
| Qujing, Simples M-ITF-CHN-13A | 2019/07/14 02:30 | Fajing Sun v Yan Bai | 3-6,1-6 |
| Qujing, Simples M-ITF-CHN-13A | 2019/07/13 02:30 | Yang, Tsung-Hua v Fajing Sun | 6-7,6-7 |
| Qujing, Simples M-ITF-CHN-13A | 2019/07/12 02:00 | Fajing Sun v Jonathan Mridha | 7-6,6-1 |
| Qujing, Simples M-ITF-CHN-13A | 2019/07/11 03:25 | Fajing Sun v Kazuma Kawachi | 6-2,6-3 |
| Qujing, Simples M-ITF-CHN-13A | 2019/07/10 05:55 | Fajing Sun v Tan, Li-Wie | 6-2,6-0 |
| Kunshan, Simples M-ITF-CHN-12A | 2019/07/07 01:30 | Yang, Tsung-Hua v Fajing Sun | 2-6,2-6 |
| Kunshan, Simples M-ITF-CHN-12A | 2019/07/06 01:30 | Fajing Sun v Xia, Haitong | 7-6,6-2 |