Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/04/03 12:30 | Dennis Klein v Sven Happek | L | 3-1 |
| Challenger Series TT | 2023/04/03 11:10 | Dauud Cheaib v Sven Happek | L | 3-0 |
| Challenger Series TT | 2023/04/03 06:30 | Pekka Pelz v Sven Happek | L | 3-0 |
| TT Star Series | 2023/03/25 11:15 | Henning Zeptner v Sven Happek | W | 0-3 |
| TT Star Series | 2023/03/25 08:10 | Sven Happek v Antonin Gavlas | L | 0-3 |
| TT Star Series | 2023/03/24 14:15 | Sven Happek v Michal Obeslo | L | 0-3 |
| TT Star Series | 2023/03/24 12:45 | Boguslav Koszyk v Sven Happek | L | 3-0 |
| TT Star Series | 2023/03/24 10:45 | Oleksandr Tymofieiev v Sven Happek | L | 3-2 |
| Challenger Series TT | 2023/03/21 08:50 | Marius Henninger v Siddharta Almeida | L | 3-0 |
| Challenger Series TT | 2023/03/20 20:50 | Dauud Cheaib v Siddharta Almeida | L | 3-1 |
| Challenger Series TT | 2023/03/20 18:50 | Jeromy Loffler v Siddharta Almeida | L | 3-1 |
| Challenger Series TT | 2023/03/20 16:50 | Siddharta Almeida v Amirreza Abbasi | L | 0-3 |
| Challenger Series TT | 2023/03/20 14:10 | Siddharta Almeida v Rafael Turrini | L | 2-3 |
| Challenger Series TT | 2023/03/20 12:10 | Siddharta Almeida v Liang Qiu | L | 1-3 |
| Challenger Series TT | 2023/03/20 09:30 | Laszlo Magyar v Siddharta Almeida | W | 2-3 |
| Challenger Series TT | 2023/02/06 20:50 | Siddharta Almeida v Bastien Dupont | L | 0-3 |