| Bulgarian Open | 2019/08/13 07:30 | Joran Kweekel v Nikolov, Daniel | L | 2-0 |
| European Games | 2019/06/25 10:15 | Luka Wraber v Nikolov, Daniel | L | 2-1 |
| Orléans Masters | 2019/03/20 16:50 | Nikolov, Daniel v Toma Junior Popov | L | 0-2 |
| Orleans Masters Qual | 2019/03/19 08:35 | Qowimuramadhoni, Azmy v Nikolov, Daniel | W | 0-2 |
| Open de Suisse - Doubles Femmes - Qualif. | 2019/02/20 10:30 | Max Weisskirchen v Nikolov, Daniel | W | 1-2 |
| Giraldilla Int. XD | 2018/09/27 19:40 | Nikolov, Daniel v Lakamagi, Labieb Muhzafar | W | 2-0 |
| Open de Suisse - Doubles Femmes - Qualif. | 2018/09/27 15:35 | Dimitar Yanakiev v Nikolov, Daniel | W | 0-2 |
| Open de Suisse - Doubles Femmes - Qualif. | 2018/09/27 07:30 | Joran Kweekel v Nikolov, Daniel | W | 0-2 |
| Polish Int. Qual | 2019/09/19 16:20 | Dubowski, Mateusz v Mangor, Nikolaj | W | 2-0 |
| Polish Int. Qual | 2019/09/19 12:50 | Bundgaard, Martin v Dubowski, Mateusz | W | 0-2 |
| Polish Int. Qual | 2019/09/19 09:20 | Dubowski, Mateusz v Krivec, Gasper | W | 2-0 |
| Belarus Int. Qual | 2019/08/30 07:40 | Dubowski, Mateusz v Chertilin, Evgeny | W | 2-0 |
| Belarus Int. Qual | 2019/08/29 11:00 | Dubowski, Mateusz v Kolesnik, Oleksandr | W | 2-0 |
| Hellas Open | 2019/08/09 12:30 | Krausz, Gergely v Dubowski, Mateusz | L | 2-0 |
| Lithuanian Int. Qual | 2019/06/07 06:00 | Brian Holtschke v Dubowski, Mateusz | W | 0-2 |
| Latvia Int. | 2019/05/31 16:30 | Aram Mahmoud v Dubowski, Mateusz | L | 2-0 |