| Challenger Ochsenhausen | 2019/07/09 11:00 | Sven Happek v Sitak, Andriy | L | 3-2 |
| Challenger Ochsenhausen | 2019/05/15 09:50 | Sven Happek v Sitak, Andriy | W | 1-3 |
| Challenger Ochsenhausen | 2018/06/22 09:50 | Sitak, Andriy v Sven Happek | L | 0-3 |
| Challenger Ochsenhausen | 2018/03/13 09:20 | Sitak, Andriy v Sven Happek | W | 3-0 |
| Challenger Ochsenhausen | 2021/07/07 11:50 | Sitak, Andriy v Jeet Chandra | L | 1-3 |
| Challenger Ochsenhausen | 2021/07/07 10:10 | Sitak, Andriy v Kuzmin, Fedor | L | 1-3 |
| Challenger Ochsenhausen | 2021/07/07 08:30 | Sitak, Andriy v Rakov, Valerij | L | 0-3 |
| TT Cup | 2021/06/11 22:15 | Sitak, Andriy v Lyevshyn, Vitaliy | L | 0-3 |
| TT Cup | 2021/06/11 21:40 | Sitak, Andriy v Melnik, Valeriy | W | 3-0 |
| TT Cup | 2021/06/11 21:05 | Sitak, Andriy v Bohdan Kohut | W | 3-1 |
| TT Cup | 2021/06/11 20:00 | Sitak, Andriy v Lyevshyn, Vitaliy | L | 2-3 |
| TT Cup | 2021/06/11 19:30 | Sitak, Andriy v Melnik, Valeriy | W | 3-2 |
| Challenger Ochsenhausen | 2021/07/07 13:10 | Sven Happek v Chtchetinine, Evgueni | 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 Schwarzer, Dwain | 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 Kuzmin, Fedor | L | 2-3 |
| Challenger Ochsenhausen | 2021/06/18 07:10 | Sven Happek v Harmeet Desai | L | 1-3 |
| Challenger Ochsenhausen | 2021/06/17 10:30 | Sven Happek v Chamorro, Miguel | L | 2-3 |