| Challenger - Ochsenhausen | 2018/01/05 13:05 | Niagol Stoyanov v Jakub Kosowski | W | 1-3 |
| Challenger - Ochsenhausen | 2018/01/03 08:10 | Jakub Kosowski v Niagol Stoyanov | L | 2-3 |
| Challenger - Ochsenhausen | 2018/12/03 12:50 | Jakub Kosowski v Josip Huzjak | W | 3-1 |
| Challenger - Ochsenhausen | 2018/12/03 10:10 | Jakub Kosowski v Mateusz Golebiowski | L | 2-3 |
| Challenger - Ochsenhausen | 2018/12/03 07:30 | Jakub Kosowski v Robert Floras | W | 3-1 |
| Challenger - Ochsenhausen | 2018/11/23 13:50 | Yannick Vostes v Jakub Kosowski | L | 3-2 |
| Challenger - Ochsenhausen | 2018/11/23 13:05 | Jakub Kosowski v Sushmit Sriram | W | 3-2 |
| Challenger - Ochsenhausen | 2018/11/23 11:30 | Jakub Kosowski v Sebestyen Kovacs | W | 3-0 |
| Challenger - Ochsenhausen | 2018/11/23 08:50 | Jakub Kosowski v Miroslav Sklensky | W | 3-0 |
| Challenger - Ochsenhausen | 2018/11/22 12:50 | Jakub Kosowski v Yannick Vostes | L | 0-3 |
| Challenger - Ochsenhausen | 2018/12/03 15:40 | Niagol Stoyanov v Miguel Vilchez | W | 3-0 |
| Challenger - Ochsenhausen | 2018/12/03 11:30 | Niagol Stoyanov v Lehel Demeter | W | 3-0 |
| Challenger - Ochsenhausen | 2018/12/03 09:30 | Niagol Stoyanov v Harmeet Desai | L | 2-3 |
| Qatar Open - Kvinder | 2018/11/08 15:20 | Zhendong Fan v Niagol Stoyanov | L | 4-1 |
| Qatar Open - Kvinder | 2018/09/20 17:50 | Lei Kou v Niagol Stoyanov | L | 4-0 |
| Qatar Open - Mixdouble | 2018/09/19 13:05 | Niagol Stoyanov v Marek Badowski | L | 3-4 |
| Qatar Open - Mixdouble | 2018/08/15 07:10 | Niagol Stoyanov v Yuki Matsuyama | W | 4-1 |
| Qatar Open - Mixdouble | 2018/05/29 02:50 | Niagol Stoyanov v Bo Fang | L | 2-4 |