| Bonn Int. Qual | 05/31 08:35 | - | Klauer, Christopher v Simon Baron-Vezilier | L | 0-2 | |
| Nantes Int. Qual | 06/23 08:20 | - | Alwi Farhan v Klauer, Christopher | L | 2-0 | |
| Bonn Int. Qual | 06/15 17:35 | - | Klauer, Christopher v Sulistio Tegar | L | 0-2 | |
| Bonn Int. Qual | 06/15 09:00 | - | Klauer, Christopher v Michal Walentek | W | 2-0 | |
| Luxembourg Open Qual | 05/05 14:00 | - | Fleischer, Andreas v Klauer, Christopher | W | 0-2 | |
| Luxembourg Open Qual | 05/05 11:40 | - | Jaeger, Jonas v Klauer, Christopher | L | 2-0 | |
| Luxembourg Open Qual | 05/05 11:40 | - | Gregor Alic v Klauer, Christopher | W | 1-2 | |
| Open de Suède | 01/21 08:20 | - | Klauer, Christopher v Joakim Oldorff | L | 0-2 | |
| Open de Suède - Qualif. | 01/20 10:20 | - | Alexander Pedersen v Klauer, Christopher | - | Walkover | |
| Welsh Int Qual | 12/01 11:55 | - | Klauer, Christopher v Varun Kapur | L | 0-2 | |
| Dutch Open (GP) 2017, Qualification | 10/13 11:40 | - | Bundgaard, Martin v Klauer, Christopher | L | 2-0 | |
| International d'Islande | 01/26 09:40 | 2 | Klauer, Christopher v Toledano, Tomas | L | 0-2 | |
| International d'Islande | 01/25 17:00 | 3 | Levit, Yonathan v Klauer, Christopher | W | 0-2 | |
| International d'Islande | 01/25 12:20 | 4 | Cholan Kayan v Klauer, Christopher | W | 1-2 | |
| International d'Islande | 01/24 16:40 | 5 | Klauer, Christopher v Mann, Robert | W | 2-0 | |
| Welsh Int. Qual | 11/28 10:00 | - | Klauer, Christopher v Alvaro Vazquez | L | 0-2 | |
| Welsh Int. Qual | 11/27 14:30 | - | Klauer, Christopher v Pearce, Luke | W | 2-0 | |
| Welsh Int. Qual | 11/27 11:00 | - | Klauer, Christopher v Quek, Ryan Jing | W | 2-0 | |
| SaarLorLux Open 2019, MS | 10/30 16:00 | 5 | Klauer, Christopher v Joran Kweekel | L | 0-2 | |
| SaarLorLux Open 2019, MS, Qualification | 10/29 12:00 | 1 | Mund, Tobias v Klauer, Christopher | W | 0-2 | |
| Hatzor Int | 10/26 07:40 | - | Klauer, Christopher v Hammes, Felix | L | 0-2 | |
| Hatzor Int | 10/25 13:00 | - | Matthew Abela v Klauer, Christopher | W | 0-2 | |
| Hatzor Int | 10/24 12:00 | - | Klauer, Christopher v Sames, Mark | W | 2-1 | |
| Hatzor Int | 10/24 10:00 | - | Klauer, Christopher v Peleg, Stav | W | 2-0 | |
| Belgian Int. Qual | 09/11 12:55 | - | Samuel Hsiao v Klauer, Christopher | L | 2-0 | |
| Hellas Int. Qual | 05/03 06:00 | - | Klauer, Christopher v Yazgan Calisir | W | 2-1 | |
| Hellas Int. Qual | 05/02 14:30 | - | Klauer, Christopher v Tsigirdakis, Stamatis | W | 2-1 | |
| Hellas Int. Qual | 05/02 11:30 | - | Klauer, Christopher v Yilmaz, Batuhan | W | 2-0 | |
| Dutch Int. - Qualif. | 04/11 18:00 | - | Bugtrup, Sebastian v Klauer, Christopher | L | 2-0 | |
| Open de Suisse - Doubles Femmes - Qualif. | 03/07 10:10 | - | Klauer, Christopher v Gergo Pytel | L | 0-2 |