Stadium: Ahnatal C4 Round: 62 Ground: Clay
| ITF Germany F8 Qual | 2018/07/15 08:30 | Karol Drzewiecki v Daniil Tsebrenko | 7-5,6-3 |
| ITF Germany F7 | 2018/07/11 11:25 | Dominik Boehler v Karol Drzewiecki | 6-2,6-1 |
| ITF Romania F2 Qual | 2018/05/28 07:30 | Karol Drzewiecki v Andrei Stefan Apostol | 2-6,4-6 |
| ITF Poland F3 | 2018/05/15 09:30 | Sekou Bangoura v Karol Drzewiecki | 3-6,7-6,6-1 |
| ITF Poland F3 Qual | 2018/05/14 07:30 | Karol Drzewiecki v Filip Kucbel | 6-7,7-6,6-2 |
| ITF Poland F3 | 2018/05/13 07:00 | Karol Drzewiecki v Adam Mlazga | 6-2,6-7,6-1 |
| ITF Great Britain F2 | 2018/02/04 17:00 | Mason Recci v Karol Drzewiecki | 7-6,6-7,6-4 |
| ITF Great Britain F1 | 2018/01/28 14:00 | Karol Drzewiecki v Jack Draper | 1-6,2-6 |
| ITF Germany F5 | 2018/06/26 13:40 | Tim Seibert v Christian Hirschmueller | 2-6,6-3,3-6 |
| ITF Germany F16 | 2017/10/22 08:00 | Kai Lemstra v Tim Seibert | 3-6,1-6 |
| ITF Germany F16 | 2017/10/22 08:00 | Tim Seibert v Valentin Guenther | 6-4,3-6,4-6 |
| ITF Germany F15 | 2017/10/16 08:00 | Ryan Peniston v Tim Seibert | 6-1,6-4 |
| ITF Germany F11 | 2017/08/13 13:00 | Jakob Aichhorn v Tim Seibert | 6-4,6-7,6-1 |
| ITF Germany F11 | 2017/08/13 08:00 | Tim Seibert v Marek Flinner | 7-6,6-2 |
| ITF Germany F10 | 2017/08/06 11:00 | Eduardo Dischinger v Tim Seibert | 6-0,7-5 |
| ITF Germany F9 | 2017/07/31 15:00 | Tim Seibert v Matthew Dellavedova | 6-2,4-6,2-6 |