| Dutch Open | 2019/10/11 17:10 | Onodera, Yusuke v Nikolov, Daniel | L | 2-0 |
| Dutch Open | 2019/10/10 15:10 | Heino, Eetu v Nikolov, Daniel | W | 1-2 |
| Dutch Open | 2019/10/09 16:35 | Weng, H. Y. v Nikolov, Daniel | W | 1-2 |
| Dutch Open | 2019/10/08 15:40 | Nikolov, Daniel v Mendrek, Adam | W | 2-0 |
| Dutch Open (GP) 2017, Qualification | 2019/10/08 08:00 | Nikolov, Daniel v Karan Rajan Rajarajan | W | 2-0 |
| Polish Int. | 2019/09/21 10:40 | Nikolov, Daniel v Mads Christophersen | L | 1-2 |
| Polish Int. | 2019/09/20 13:40 | Nikolov, Daniel v Dubowski, Mateusz | W | 2-1 |
| Bulgarian Open | 2019/08/13 07:30 | Joran Kweekel v Nikolov, Daniel | L | 2-0 |
| Irish Open Qual | 2019/11/13 11:05 | Leon Seiwald v Pang, Victor | W | 2-0 |
| Hungarian Int. Qual | 2019/10/30 17:10 | Leon Seiwald v Tobias Kuenzi | L | 0-2 |
| Polish Int. | 2019/09/21 09:55 | Ivan Rusev v Leon Seiwald | L | 2-0 |
| Polish Int. | 2019/09/20 10:20 | Leon Seiwald v Joonas Korhonen | W | 2-1 |
| Belgian International 2019, MS | 2019/09/12 13:00 | Luis Enrique Penalver v Leon Seiwald | L | 2-1 |
| Kharkiv International 2019, MS, Qualification | 2019/09/04 11:30 | Leon Seiwald v Gergo Pytel | L | 1-2 |
| Belarus Int. | 2019/08/30 10:40 | Must, Raul v Leon Seiwald | L | 2-1 |
| Slovenia Int. Qual | 2019/05/15 08:30 | Leon Seiwald v B.M. Rahul Bharadwaj | L | 0-2 |