Stadium: Court 5 Round: 26 Ground: Hardcourt outdoor
| ITF Tunisia F30 | 2018/09/04 09:00 | Seraphim, Christian v Munafo, Pedro | 6-1,6-2 |
| ITF Tunisia F30 | 2018/09/03 11:30 | Seraphim, Christian v Stefan Palosi | 6-2,6-4 |
| ITF Tunisia F30 | 2018/09/02 14:00 | Seraphim, Christian v Kuzey Cekirge | 6-2,6-3 |
| Challenger Pullach Qual | 2018/08/04 12:10 | Avidzba, Alen v Seraphim, Christian | 6-3,6-4 |
| ITF Germany F9 | 2018/07/23 10:00 | Seraphim, Christian v Schmitz, Constantin | 3-6,4-6 |
| ITF Germany F9 | 2018/07/22 15:30 | Seraphim, Christian v Oscar Moraing | 6-4,7-6 |
| ITF Germany F9 | 2018/07/22 08:00 | Kopeinigg, Daniel v Seraphim, Christian | 4-6,3-6 |
| ITF Austria F3 | 2018/07/14 07:15 | Hubner, Edward v Seraphim, Christian | 6-2,5-7,7-5 |
| ITF Tunisia F30 | 2018/09/05 09:00 | Groener, Jakob v Johnson, Luke | 5-7,2-6 |
| ITF Italy F25 | 2018/08/29 12:00 | Reinwein, Sami v Johnson, Luke | 6-4,6-4 |
| ITF Italy F25 | 2018/08/27 12:00 | Zarichanskiy, D. v Johnson, Luke | 0-6,3-6 |
| ITF Ireland F1 | 2018/08/01 08:30 | Berg, Conor v Johnson, Luke | 4-6,6-3,6-2 |
| Challenger Granby Qual | 2018/07/22 21:30 | Wishaya Trongcharoenchaikul v Johnson, Luke | 4-6,6-4,6-3 |
| Challenger Granby Qual | 2018/07/21 18:20 | Dan Martin v Johnson, Luke | 3-6,6-7 |
| Challenger Gatineau Qual | 2018/07/15 01:05 | Johnson, Luke v Garanganga, Takanyi | 4-6,4-6 |
| Challenger Winnipeg Qual | 2018/07/08 15:00 | Wolf, Jeffrey John v Johnson, Luke | 6-3,6-1 |