| Challenger Ochsenhausen | 2021/12/15 10:10 | Sven Happek v Josip Huzjak | L | 2-3 |
| Challenger Ochsenhausen | 2021/12/03 08:50 | Sven Happek v Josip Huzjak | W | 3-2 |
| Challenger Ochsenhausen | 2021/07/14 11:50 | Sven Happek v Josip Huzjak | W | 3-1 |
| Challenger Ochsenhausen | 2021/03/31 09:50 | Josip Huzjak v Sven Happek | W | 2-3 |
| Challenger Ochsenhausen | 2021/03/10 10:50 | Sven Happek v Josip Huzjak | W | 3-1 |
| Challenger Ochsenhausen | 2021/01/29 08:50 | Sven Happek v Josip Huzjak | L | 1-3 |
| Challenger Ochsenhausen | 2020/04/29 10:30 | Sven Happek v Josip Huzjak | W | 4-0 |
| Challenger Ochsenhausen | 2020/03/17 14:15 | Josip Huzjak v Sven Happek | W | 0-3 |
| Challenger Series TT | 2022/02/24 18:50 | Sven Happek v Dillon Chambers | L | 1-3 |
| Challenger Ochsenhausen | 2022/02/24 17:30 | Sven Happek v Alexander Valuch | L | 0-3 |
| Challenger Series TT | 2022/02/24 12:50 | Sven Happek v Amirreza Abbasi | L | 1-3 |
| Challenger Series TT | 2022/02/24 10:10 | Sven Happek v Matteo Mutti | L | 1-3 |
| Challenger Series TT | 2022/02/24 07:30 | Sven Happek v Daniel Rinderer | L | 1-3 |
| Challenger Ochsenhausen | 2022/02/11 08:50 | Jakub Seibert v Sven Happek | W | 2-3 |
| Challenger Ochsenhausen | 2022/02/11 08:10 | Eric Jouti v Sven Happek | L | 3-2 |
| Challenger Ochsenhausen | 2022/02/10 17:30 | Sanil Shetty v Sven Happek | L | 3-0 |
| Challenger Series TT | 2022/02/24 16:10 | Josip Huzjak v Daniel Rinderer | L | 0-3 |
| Challenger Series TT | 2022/02/24 14:10 | Dillon Chambers v Josip Huzjak | W | 2-3 |
| Challenger Ochsenhausen | 2022/02/24 11:30 | Alexander Valuch v Josip Huzjak | L | 3-0 |
| Challenger Series TT | 2022/02/24 08:50 | Amirreza Abbasi v Josip Huzjak | L | 3-1 |
| Challenger Ochsenhausen | 2022/02/22 10:50 | Josip Huzjak v Andrei Putuntica | L | 0-3 |
| Challenger Ochsenhausen | 2022/02/22 07:30 | Josip Huzjak v Jiri Martinko | L | 0-3 |
| Challenger Ochsenhausen | 2022/02/21 18:50 | Josip Huzjak v Rafael Turrini | L | 0-3 |
| Challenger Ochsenhausen | 2022/02/21 17:30 | Josip Huzjak v Carlos Muhlbach | L | 1-3 |