| Dutch Int. - Qualif. | 2019/04/11 18:00 | Bugtrup, Sebastian v Klauer, Christopher | L | 2-0 |
| Open de Suisse - Doubles Femmes - Qualif. | 2019/03/07 10:10 | Klauer, Christopher v Gergo Pytel | L | 0-2 |
| Open de Suisse - Doubles Femmes - Qualif. | 2019/01/10 09:00 | Valentin Singer v Klauer, Christopher | L | 2-0 |