| Czech Open Qual | 2021/10/21 07:40 | Samuel Hsiao v Varot Uraiwong | L | 0-2 |
| Thomas Cup | 2021/10/13 17:20 | Samuel Hsiao v Christo Popov | L | 0-2 |
| Thomas Cup | 2021/10/11 17:00 | Viktor Axelsen v Samuel Hsiao | L | 2-0 |
| Polish Int. | 2021/09/24 12:40 | Samuel Hsiao v Magnus Johannesen | L | 0-2 |
| Austrian Open | 2021/05/28 14:05 | Samuel Hsiao v Alex Lanier | L | 1-2 |
| Slovenia Int. | 2021/05/20 10:20 | Samuel Hsiao v Panji Ahmad Maulana | L | 1-2 |
| Portuguese Int. Qual | 2021/05/06 15:20 | Adi Pratama v Samuel Hsiao | L | 2-0 |
| Portuguese Int. Qual | 2021/05/06 12:30 | Samuel Hsiao v Jonas Schwarz | W | 2-1 |
| Dutch Open | 2021/10/16 08:20 | Daniel Nikolov v Xiaodong Sheng | L | 0-2 |
| Dutch Open | 2021/10/15 12:50 | Daniel Nikolov v Jacob Nilsson | W | 2-0 |
| Dutch Open | 2021/10/14 10:35 | Ygor Coelho v Daniel Nikolov | W | 1-2 |
| Dutch Open Qual | 2021/10/13 12:50 | Wolfgang Gnedt v Daniel Nikolov | W | 1-2 |
| Bulgarian Int | 2021/10/10 08:20 | Meiraba Luwang Maisnam v Daniel Nikolov | L | 2-1 |
| Bulgarian Int | 2021/10/09 13:20 | Leo Van Gysel v Daniel Nikolov | W | 0-2 |
| Bulgarian Int | 2021/10/09 07:35 | Daniel Nikolov v Mateusz Danielak | W | 2-0 |
| Bulgarian Int | 2021/10/08 13:35 | Brian Holtschke v Daniel Nikolov | W | 1-2 |