Stadium: Table 2
| WTT Contender Doha | 2022/03/19 12:45 | Ioannis Sgouropoulos v Niagol Stoyanov | L | 3-0 |
| Qatar Open XD | 2016/10/19 13:32 | Niagol Stoyanov v Ioannis Sgouropoulos | L | 2-4 |
| 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 |
| ITTF World Championships | 2023/05/21 09:45 | Jeremy Dey v Niagol Stoyanov | W | 0-4 |
| WTT Star Contender Bangkok Quals | 2023/04/24 05:00 | Daeseong Cho v Niagol Stoyanov | L | 3-1 |
| WTT Star Contender Bangkok Quals | 2023/04/23 05:50 | Zhe Yu Clarence Chew v Niagol Stoyanov | W | 2-3 |
| WTT Singapore Smash Quals | 2023/03/07 03:00 | Benedek Olah v Niagol Stoyanov | L | 3-2 |
| WTT Feeder Dusseldorf | 2023/02/16 12:45 | Deni Kozul v Niagol Stoyanov | L | 3-0 |
| WTT Feeder Dusseldorf | 2023/02/15 16:50 | Niagol Stoyanov v Chun Ting Wong | W | 3-1 |
| European Team Championships | 2023/05/06 07:30 | Ioannis Sgouropoulos v Martin Froseth | W | 3-0 |
| European Team Championships | 2023/05/05 14:30 | Carlos Caballero v Ioannis Sgouropoulos | W | 1-3 |
| Europe Cup | 2023/04/01 11:55 | Kaii Konishi v Ioannis Sgouropoulos | L | 3-0 |
| Europe Cup | 2023/02/15 18:50 | Ioannis Sgouropoulos v Esteban Dorr | W | 3-0 |
| Europe Cup | 2023/02/13 18:30 | Esteban Dorr v Ioannis Sgouropoulos | W | 0-3 |
| Champions League | 2022/11/22 20:20 | Ioannis Sgouropoulos v Ovidiu Ionescu | L | 2-3 |
| Champions League | 2022/11/19 17:20 | Daniel Habesohn v Ioannis Sgouropoulos | L | 3-2 |
| Champions League | 2022/11/13 17:30 | Nandor Ecseki v Ioannis Sgouropoulos | W | 0-3 |