| Turkey F14, Singles Qualifying | 2014/03/21 10:40 | Peter Heller v Mertl, Jan | 5-7,4-6 |
| ITF Hungary F1 | 2017/05/09 09:30 | Peter Heller v Kern, Robin | 6-7,3-6 |
| ITF Turkey F11 | 2017/03/19 07:00 | Cengiz Aksu v Peter Heller | 4-6,0-6 |
| ITF Turkey F11 | 2017/03/18 07:00 | Mnushkin, Dmitry v Peter Heller | 0-6,0-6 |
| Challenger Marburg Qual | 2016/06/26 08:00 | Peter Heller v Betov, Sergey | 6-3,3-6,3-6 |
| ITF Germany F4 | 2016/06/23 12:45 | Peter Heller v Krawietz, Kevin | 1-6,3-6 |
| Turkey F10, Singles Qualifying | 2016/03/11 10:20 | Raab, Demian v Peter Heller | 1-6,7-5,6-4 |
| Turkey F10, Singles Qualifying | 2016/03/10 09:25 | Dowson, Dan v Peter Heller | 5-7,7-6,3-6 |
| Turkey F10, Singles Qualifying | 2016/03/09 11:50 | Gohlke, Delf v Peter Heller | 0-6,1-6 |
| Challenger Ostrava Qual | 2017/05/01 09:00 | Mertl, Jan v El Amrani, Reda | 2-6,2-6 |
| Challenger Ostrava Qual | 2017/04/30 10:50 | Petr Michnev v Mertl, Jan | 5-7,2-6 |
| Challenger Ostrava Qual | 2017/04/29 10:10 | Mertl, Jan v Mugevicius, Lukas | 6-3,6-1 |
| ITF China F5 | 2017/04/13 03:00 | Zhizhen Zhang v Mertl, Jan | 6-2,3-6,6-3 |
| ITF China F5 | 2017/04/11 04:40 | Xia, Zihao v Mertl, Jan | 3-6,3-6 |
| ITF China F4 | 2017/04/08 02:30 | Zhe Li v Mertl, Jan | 6-3,7-5 |
| ITF China F4 | 2017/04/07 03:25 | Mertl, Jan v Kapas, Andriej | 7-6,4-6,6-4 |
| ITF China F4 | 2017/04/05 04:35 | Mertl, Jan v He, Yecong | 7-6,6-3 |