Stadium: Court 1 Round: 54 Ground: Clay
| ITF Germany F16 | 2018/10/21 17:15 | Todorov, Maximilian v Kosinski, Patryk | 6-2,6-0 |
| Challenger Szczecin | 2018/09/08 13:05 | Wojcik, Yann v Kosinski, Patryk | 6-3,6-2 |
| ITF Poland F8 | 2018/08/18 08:00 | Pointon, Samuel v Kosinski, Patryk | 7-6,6-2 |
| ITF Poland F7 | 2018/08/11 11:00 | Kosinski, Patryk v Piatek, Mateusz | 5-7,2-6 |
| ITF Poland F6 | 2018/08/09 14:50 | Maciej Rajski v Kosinski, Patryk | 6-3,6-4 |
| ITF Poland F6 | 2018/08/07 12:30 | Kosinski, Patryk v Skonieczny, Michal | 6-2,7-6 |
| ITF Poland F6 Qual | 2018/08/06 10:55 | Bogatin, David v Kosinski, Patryk | 2-6,5-7 |
| ITF Poland F6 Qual | 2018/08/05 12:30 | Kosinski, Patryk v Tsebrenko, Daniil | 6-1,7-6 |
| ITF Poland F2 | 2018/05/05 11:00 | Kwiatkowski, Adam v Yatsuk, Ivan | 6-7,7-6,3-6 |
| ITF Poland F1 | 2018/04/28 10:30 | Kwiatkowski, Adam v Vrba, Daniel | 1-6,1-6 |