Stadium: Ochsenhausen, Germany
| Challenger Series TT | 2023/06/19 14:30 | Sven Happek v Marco Stefanidis | L | 3-1 |
| Challenger Series TT | 2023/11/27 10:10 | Aljaz Godec v Marco Stefanidis | L | 3-1 |
| Challenger Series TT | 2023/11/27 08:10 | Marco Stefanidis v Liang Qiu | L | 0-3 |
| Challenger Series TT | 2023/09/15 09:50 | Marco Stefanidis v Guillaume Alcayde | L | 0-3 |
| Challenger Series TT | 2023/09/14 17:50 | Marco Stefanidis v Antonin Gavlas | L | 0-3 |
| Challenger Series TT | 2023/09/14 14:30 | Marco Stefanidis v Simon Berglund | L | 0-3 |
| Challenger Series TT | 2023/09/14 12:30 | Marco Stefanidis v Akito Itagaki | W | 3-1 |
| Challenger Series TT | 2023/09/14 09:10 | Jin Ueda v Marco Stefanidis | L | 3-0 |
| Challenger Series TT | 2023/09/14 07:10 | Marco Stefanidis v Kirill Fadeev | L | 1-3 |
| Challenger Series TT | 2024/03/05 08:10 | Alexander Valuch v Sven Happek | L | 3-0 |
| Challenger Series TT | 2024/03/04 18:50 | Zhenlong Liu v Sven Happek | W | 2-3 |
| Challenger Series TT | 2024/03/04 16:10 | Sven Happek v Nico Longhino | L | 2-3 |
| Challenger Series TT | 2024/03/04 13:30 | Sven Happek v Pekka Pelz | L | 1-3 |
| Challenger Series TT | 2024/03/04 12:10 | Sven Happek v Eusebio Vos | W | 3-2 |
| Challenger Series TT | 2024/03/04 09:30 | Marius Henninger v Sven Happek | L | 3-0 |
| Challenger Series TT | 2024/02/27 11:30 | Alexander Valuch v Sven Happek | L | 3-1 |
| Challenger Series TT | 2024/02/27 07:30 | Akito Itagaki v Sven Happek | W | 1-3 |