Stadium: Wisla Centrum 2 Round: 25 Ground: Clay
| ITF Poland F1 | 2018/05/01 12:15 | Kossek, Daniel v Piotr Grynkowski | 1-6,1-6 |
| Turkey F14, Singles Qualifying | 2018/04/07 09:30 | Kossek, Daniel v Felipe Meligeni Rodrigues Alves | 0-6,0-6 |
| ITF Tunisia F9 | 2018/03/06 11:05 | Vibert, Francois Arthur v Kossek, Daniel | 6-0,6-1 |
| ITF Tunisia F8 | 2018/02/25 11:00 | Rogic Hadzalic, Alen v Kossek, Daniel | 6-1,7-6 |
| ITF Tunisia F8 | 2018/02/24 11:30 | Kerschbaumer, Michael v Kossek, Daniel | 4-6,5-7 |
| ITF Tunisia F7 | 2018/02/17 10:30 | Kossek, Daniel v Adam Jones | 3-6,2-6 |
| ITF South Africa F3 Qual | 2017/12/04 09:20 | Ianakiev, Milen v Kossek, Daniel | 6-3,6-2 |
| ITF South Africa F3 Qual | 2017/12/03 13:30 | Caripi, Vasilios v Kossek, Daniel | 4-6,6-4,5-7 |
| ITF Poland F1 | 2018/05/01 15:10 | Paluch, Karol v Kozielski, Lukasz | 6-2,6-3 |
| ITF Croatia F3 | 2018/03/18 08:30 | Kozielski, Lukasz v Kisantal, Dominik | 2-6,7-5,2-6 |
| ITF Germany F2 Qual | 2018/01/21 08:30 | Kozielski, Lukasz v Jablonski, Maciej | 4-6,4-6 |
| ITF Egypt F38 | 2017/12/13 12:30 | Kozielski, Lukasz v Barton, Dominik | 0-6,0-6 |
| ITF Egypt F38 | 2017/12/11 08:30 | Kozielski, Lukasz v Barton, Dominik | 5-7,5-7 |
| ITF Egypt F38 | 2017/12/10 08:00 | Kozielski, Lukasz v El Sayed, Ashraf | 7-6,6-1 |
| ITF Egypt F37 | 2017/12/04 10:30 | Kozielski, Lukasz v Carlone, Nicolas | 6-4,3-6,4-6 |
| ITF Egypt F37 | 2017/12/03 09:00 | Kozielski, Lukasz v van Meter, Joseph W | 6-7,7-5,6-3 |