| WTT Contender - Doha - Kvalifikation | 01/15 16:05 | - | Niagol Stoyanov v Ebrahim Gubran | W | 3-0 | |
| WTT Contender Novo Gorica | 11/01 10:15 | - | Niagol Stoyanov v Ganghyeon Park | L | 0-3 | |
| WTT Contender Muscat - Kvalifikation | 09/06 12:45 | - | Niagol Stoyanov v Yebo Liu | L | 1-3 | |
| WTT Feeder - Panagyurishte | 09/02 12:20 | - | Niagol Stoyanov v Andrei Istrate | L | 1-4 | |
| WTT Feeder Olomouc | 08/25 14:30 | - | Niagol Stoyanov v David Serdaroglu | L | 1-4 | |
| EM | 08/17 18:30 | 6 | Niagol Stoyanov v Marcos Freitas | L | 0-4 | |
| EM | 08/15 07:30 | - | Niagol Stoyanov v Ibrahim Gunduz | L | 2-3 | |
| EM | 08/14 13:55 | - | Niagol Stoyanov v Joan Masip | W | 3-1 | |
| WTT Star Contender Budapest Quals | 07/12 16:30 | - | Woojin Jang v Niagol Stoyanov | L | 3-0 | |
| WTT Star Contender Budapest Quals | 07/11 16:30 | - | Niagol Stoyanov v Daniel Habesohn | W | 3-2 | |
| WTT Feeder Westchester | 05/13 16:00 | - | Niagol Stoyanov v Benedikt Duda | L | 1-4 | |
| WTT Contender - Doha | 03/19 12:45 | - | Ioannis Sgouropoulos v Niagol Stoyanov | L | 3-0 | |
| WTT Feeder - Doha | 03/15 16:40 | - | Niagol Stoyanov v Ziyang Yu | L | 0-4 | |
| WTT Feeder - Doha | 03/15 10:05 | - | Niagol Stoyanov v Mehdi Bouloussa | L | 2-3 | |
| WTT Singapore Smash | 03/07 09:35 | - | Niagol Stoyanov v Nima Alamian | L | 0-3 | |
| World Championship | 11/24 02:40 | 57 | Niagol Stoyanov v Qihao Zhou | L | 0-4 | |
| WTT Contender Lasko | 11/02 17:00 | - | Ivor Ban v Niagol Stoyanov | L | 3-0 | |
| WTT Contender Lasko | 11/02 08:35 | - | Sora Matsushima v Niagol Stoyanov | W | 2-3 | |
| WTT Contender - Tunis | 10/25 17:45 | - | Niagol Stoyanov v Hunor Szocs | L | 0-3 | |
| WTT Contender - Tunis | 10/24 19:15 | - | Niagol Stoyanov v Alex Naumi | W | 3-0 | |
| EM - Hold | 09/30 08:40 | - | Niagol Stoyanov v Adam Szudi | W | 3-2 | |
| EM - Hold | 09/30 07:35 | - | Niagol Stoyanov v Nandor Ecseki | L | 0-3 | |
| EM - Hold | 09/29 08:55 | - | Andrej Gacina v Niagol Stoyanov | L | 3-2 | |
| EM - Hold | 09/29 07:00 | - | Tomislav Pucar v Niagol Stoyanov | W | 0-3 | |
| EM - Hold | 09/28 07:00 | - | Lubomir Jancarik v Niagol Stoyanov | L | 3-2 | |
| Challenger - Ochsenhausen | 09/14 10:20 | - | Alexander Valuch v Niagol Stoyanov | W | 0-3 | |
| Challenger - Ochsenhausen | 09/14 08:20 | - | Niagol Stoyanov v Petr David | W | 3-0 | |
| Challenger - Ochsenhausen | 09/13 20:00 | - | Evgueni Chtchetinine v Niagol Stoyanov | L | 3-1 | |
| Challenger - Ochsenhausen | 09/13 17:20 | - | David Reitspies v Niagol Stoyanov | L | 3-0 | |
| Challenger - Ochsenhausen | 09/13 14:40 | - | Niagol Stoyanov v Fedor Kuzmin | L | 1-3 |