| WTT Feeder Panagyurishte | 2023/08/31 14:40 | Esteban Dorr v Niagol Stoyanov | L | 3-1 |
| WTT Feeder Olomouc | 2023/08/24 15:45 | Niagol Stoyanov v Kristian Karlsson | L | 1-3 |
| WTT Feeder Havirov | 2023/07/28 15:50 | Luka Mladenovic v Niagol Stoyanov | L | 3-1 |
| WTT Star Contender Ljubljana Quals | 2023/07/04 08:10 | Niagol Stoyanov v Mehdi Bouloussa | L | 1-3 |
| WTT Star Contender Ljubljana Quals | 2023/07/03 17:55 | Niagol Stoyanov v Jakub Dyjas | W | 3-1 |
| WTT Contender Zagreb Quals | 2023/06/27 11:45 | Niagol Stoyanov v Ioannis Sgouropoulos | L | 0-3 |
| WTT Contender Lagos Quals | 2023/06/13 11:45 | Junsung Oh v Niagol Stoyanov | L | 3-0 |
| ITTF World Championships | 2023/05/22 17:40 | Dimitrij Ovtcharov v Niagol Stoyanov | L | 4-1 |
| WTT Feeder Bangkok | 2023/09/06 11:20 | Chayaduj Maungwhan v Yanghyun Kim | W | 0-3 |
| North American Open | 2019/12/05 19:10 | Yanghyun Kim v Bastian Rembert | L | 0-4 |
| Oman Open U21 Women | 2019/12/04 16:20 | Jeremy Hazin v Yanghyun Kim | L | 3-1 |