Round: 26 Ground: Clay
| ITF Poland F1 MD | 2018/04/30 16:05 | Den Heijer/Van Der Horst v Kowalczyk/Kozielski | 6-3,3-6,10-6 |
| ITF Croatia F3 MD | 2018/03/23 14:30 | Celebic/Nagy v Kowalczyk/Kozielski | 6-2,6-2 |
| ITF Croatia F3 MD | 2018/03/20 13:00 | Antonescu/Dima v Kowalczyk/Kozielski | 6-7,6-7 |
| ITF Germany F2 MD | 2018/01/23 13:30 | Kowalczyk/Kozielski v Hassan/Schell | 2-6,6-4,6-10 |
| ITF Egypt F38 MD | 2017/12/15 08:00 | Kowalczyk/Kozielski v Goveas/Kadhe | 4-6,3-6 |
| ITF Egypt F37 MD | 2017/12/05 13:45 | Fellin/Weis v Kowalczyk/Kozielski | 2-6,6-3,10-7 |
| ITF Poland F8 MD | 2017/08/01 17:00 | Dembek/Smola v Kowalczyk/Kozielski | 6-2,6-2 |