| Open del Qatar Femminili | 2018/09/20 17:50 | Lei Kou v Niagol Stoyanov | W | 4-0 |
| Olympic Qualification | 2021/03/15 07:00 | Lei Kou v Marcelo Aguirre | W | 4-2 |
| WTT Star Contender Doha | 2021/03/07 08:45 | Daeseong Cho v Lei Kou | L | 3-2 |
| WTT Contender Doha | 2021/03/01 09:00 | Masaki Yoshida v Lei Kou | L | 3-2 |
| Challenger - Ochsenhausen | 2021/01/22 17:20 | Piotr Michalski v Lei Kou | W | 0-3 |
| Challenger - Ochsenhausen | 2020/10/16 17:54 | Szymon Malicki v Lei Kou | W | 0-2 |
| Challenger - Ochsenhausen | 2020/10/16 16:40 | Patryk Chojnowski v Lei Kou | W | 0-3 |
| Challenger - Ochsenhausen | 2020/03/06 17:06 | Zengyi Wang v Lei Kou | L | 3-2 |
| Open d’Ungheria | 2020/02/19 09:40 | Anton Kallberg v Lei Kou | L | 4-1 |
| Olympic Qualification | 2021/03/14 13:01 | Niagol Stoyanov v Sharath Kamal Achanta | W | 4-2 |
| WTT Star Contender Doha | 2021/03/06 16:54 | Niagol Stoyanov v Nima Alamian | L | 1-3 |
| Challenger - Ochsenhausen | 2020/09/25 09:50 | Daniel Gorak v Niagol Stoyanov | W | 1-3 |
| Challenger - Ochsenhausen | 2020/09/25 07:50 | Jiri Martinko v Niagol Stoyanov | L | 3-0 |
| Challenger - Ochsenhausen | 2020/09/24 11:10 | Niagol Stoyanov v Jakub Kosowski | L | 2-3 |
| Challenger - Ochsenhausen | 2020/09/24 07:50 | Niagol Stoyanov v Miroslav Horejsi | L | 1-3 |
| Challenger - Ochsenhausen | 2020/09/24 06:30 | Dauud Cheaib v Niagol Stoyanov | L | 3-0 |
| Challenger - Ochsenhausen | 2020/09/23 10:30 | Alberto Mino v Niagol Stoyanov | L | 3-0 |