| Internazionali del Belgio - Qual. | 2019/09/11 12:55 | Samuel Hsiao v Christopher Klauer | L | 2-0 |
| Hellas International - Qual. | 2019/05/03 06:00 | Christopher Klauer v Yazgan Calisir | W | 2-1 |
| Hellas International - Qual. | 2019/05/02 14:30 | Christopher Klauer v Stamatis Tsigirdakis | W | 2-1 |
| Hellas International - Qual. | 2019/05/02 11:30 | Christopher Klauer v Batuhan Yilmaz | W | 2-0 |
| Internazionali d'Olanda - Qual. | 2019/04/11 18:00 | Sebastian Bugtrup v Christopher Klauer | L | 2-0 |
| Open di Svizzera DF - Qual. | 2019/03/07 10:10 | Christopher Klauer v Gergo Pytel | L | 0-2 |
| Open di Svizzera DF - Qual. | 2019/01/10 09:00 | Valentin Singer v Christopher Klauer | L | 2-0 |