| Challenger Ochsenhausen | 2021/07/08 08:30 | Andriy Sitak v Sven Happek | L | 3-2 |
| Challenger Ochsenhausen | 2019/07/09 11:00 | Sven Happek v Andriy Sitak | W | 3-2 |
| Challenger Ochsenhausen | 2019/05/15 09:50 | Sven Happek v Andriy Sitak | L | 1-3 |
| Challenger Ochsenhausen | 2018/06/22 09:50 | Andriy Sitak v Sven Happek | W | 0-3 |
| Challenger Ochsenhausen | 2018/03/13 09:20 | Andriy Sitak v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2021/10/14 06:30 | Amirreza Abbasi v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2021/10/13 10:30 | Andrei Putuntica v Sven Happek | L | 3-1 |
| Challenger Ochsenhausen | 2021/10/13 07:50 | Dauud Cheaib v Sven Happek | L | 3-0 |
| Challenger Ochsenhausen | 2021/10/01 10:30 | Sven Happek v Miguel Chamorro | L | 2-3 |
| Challenger Ochsenhausen | 2021/10/01 07:50 | Sven Happek v Dauud Cheaib | L | 0-3 |
| Challenger Ochsenhausen | 2021/09/30 11:50 | Sven Happek v Carlo Rossi | W | 3-1 |
| Challenger Ochsenhausen | 2021/09/30 08:30 | Sven Happek v Evgueni Chtchetinine | W | 3-2 |
| Challenger Ochsenhausen | 2021/09/29 11:50 | Sven Happek v Tal Israeli | W | 3-2 |
| Challenger Ochsenhausen | 2021/10/13 12:30 | Evgueni Chtchetinine v Andriy Sitak | W | 2-3 |
| Challenger Ochsenhausen | 2021/10/13 11:10 | Amirreza Abbasi v Andriy Sitak | L | 3-2 |
| Challenger Ochsenhausen | 2021/10/13 06:30 | Alexander Valuch v Andriy Sitak | L | 3-2 |
| Challenger Ochsenhausen | 2021/10/12 09:00 | Marius Henninger v Andriy Sitak | W | 0-3 |
| Challenger Ochsenhausen | 2021/10/12 08:20 | Andrei Putuntica v Andriy Sitak | L | 3-0 |
| Challenger Ochsenhausen | 2021/10/11 18:00 | Amirreza Abbasi v Andriy Sitak | L | 3-1 |
| Challenger Ochsenhausen | 2021/10/11 16:00 | Simon Berglund v Andriy Sitak | L | 3-0 |
| Challenger Ochsenhausen | 2021/10/11 12:30 | Dennis Klein v Andriy Sitak | L | 3-1 |