| Challenger Ochsenhausen | 2021/06/18 09:50 | Sven Happek v Fedor Kuzmin | W | 2-3 |
| Challenger Ochsenhausen | 2021/03/12 12:25 | Fedor Kuzmin v Sven Happek | W | 3-0 |
| Challenger Ochsenhausen | 2021/03/12 10:10 | Sven Happek v Fedor Kuzmin | W | 1-3 |
| Challenger Ochsenhausen | 2021/02/12 10:10 | Sven Happek v Fedor Kuzmin | W | 0-3 |
| Challenger Ochsenhausen | 2020/01/08 08:10 | Fedor Kuzmin v Sven Happek | W | 3-1 |
| Challenger Ochsenhausen | 2019/11/21 10:50 | Fedor Kuzmin v Sven Happek | W | 3-1 |
| Challenger Ochsenhausen | 2019/07/15 16:40 | Fedor Kuzmin v Sven Happek | W | 3-1 |
| Challenger Ochsenhausen | 2019/07/01 15:20 | Sven Happek v Fedor Kuzmin | W | 1-3 |
| Challenger Ochsenhausen | 2021/07/08 07:10 | Fedor Kuzmin v Jeet Chandra | W | 3-2 |
| Challenger Ochsenhausen | 2021/07/07 12:30 | Fedor Kuzmin v Valerij Rakov | W | 3-0 |
| Challenger Ochsenhausen | 2021/07/07 10:10 | Andriy Sitak v Fedor Kuzmin | W | 1-3 |
| Challenger Ochsenhausen | 2021/07/07 08:55 | Fedor Kuzmin v Evgueni Chtchetinine | W | 3-0 |
| Challenger Ochsenhausen | 2021/06/18 13:30 | Dauud Cheaib v Fedor Kuzmin | L | 3-2 |
| Challenger Ochsenhausen | 2021/06/18 13:05 | Harmeet Desai v Fedor Kuzmin | W | 2-3 |
| Challenger Ochsenhausen | 2021/06/18 09:50 | Sven Happek v Fedor Kuzmin | W | 2-3 |
| Challenger Ochsenhausen | 2021/06/18 07:50 | Henning Zeptner v Fedor Kuzmin | W | 1-3 |
| Challenger Ochsenhausen | 2021/07/08 08:30 | Andriy Sitak v Sven Happek | L | 3-2 |
| Challenger Ochsenhausen | 2021/07/07 13:10 | Sven Happek v Evgueni Chtchetinine | L | 2-3 |
| Challenger Ochsenhausen | 2021/07/07 11:00 | Sven Happek v Snehit Suravajjula | L | 0-3 |
| Challenger Ochsenhausen | 2021/07/07 09:45 | Sven Happek v Dwain Schwarzer | W | 3-2 |
| Challenger Ochsenhausen | 2021/06/18 12:50 | Sven Happek v Harmeet Desai | L | 0-3 |
| Challenger Ochsenhausen | 2021/06/18 11:25 | Dauud Cheaib v Sven Happek | L | 3-1 |
| Challenger Ochsenhausen | 2021/06/18 09:50 | Sven Happek v Fedor Kuzmin | L | 2-3 |
| Challenger Ochsenhausen | 2021/06/18 07:10 | Sven Happek v Harmeet Desai | L | 1-3 |