| Ungern Int. - Kval | 2019/10/30 10:20 | Hannes Gerberich v Gergo Pytel | L | 0-2 |
| Polish Int. - Kval | 2019/09/19 08:45 | Philip I Klindt v Hannes Gerberich | L | 2-0 |
| Belgian Int. - Kval | 2019/09/11 10:40 | Hannes Gerberich v Joran Kweekel | L | 0-2 |
| Kharkiv Int. - Kval | 2019/09/05 06:00 | Hannes Gerberich v Elias Bracke | L | 0-2 |
| Bulgarian Open - Kval | 2019/08/12 07:40 | Martin Ouazzen v Hannes Gerberich | L | 2-0 |
| Orleans Masters - Kval | 2019/03/19 08:35 | Hannes Gerberich v Elias Bracke | L | 0-2 |
| Swiss Open - Damdubbel - Kval | 2019/02/20 09:30 | Hannes Gerberich v Yoshitaka Ogura | L | 1-2 |
| Giraldilla Int. - Mixed dubbel | 2018/11/29 13:00 | Kari Gunnarsson v Hannes Gerberich | L | 2-0 |
| Slovenien - Future Series - Kval | 2019/11/21 08:25 | Oguzhan Mehmet Celik v Nicolas A. Mueller | - | away |
| Slovenien - Future Series - Kval | 2019/11/21 08:00 | Nicolas A. Mueller v Rajat Rathore | L | 0-2 |
| Ungern Int. - Kval | 2019/10/30 12:20 | Nicolas A. Mueller v Andy Tsai | L | 0-2 |
| Cypern - Int. | 2019/10/11 09:20 | Nicolas A. Mueller v Julien Carraggi | L | 0-2 |
| Cyprus Int. Qual | 2019/10/10 13:30 | Orestis Pissis v Nicolas A. Mueller | W | 0-2 |
| Cyprus Int. Qual | 2019/10/10 11:30 | Christos Hailis v Nicolas A. Mueller | W | 0-2 |
| Bulgarian Int. | 2019/10/04 07:00 | Peyo Boichinov v Nicolas A. Mueller | L | 2-1 |
| Belarus Int. | 2019/08/30 11:10 | Aram Mahmoud v Nicolas A. Mueller | L | 2-0 |