Stadium: Wisla Centrum 2 Round: 25 Ground: Clay
| Turkey F16, Singles Qualifying | 2018/04/25 07:30 | Nik Razborsek v Erler, Alexander | 3-6,6-3,6-1 |
| ITF Egypt F11 | 2018/03/27 08:00 | Ribeiro Marcondes, Igor v Erler, Alexander | 6-1,6-1 |
| ITF Egypt F10 | 2018/03/22 08:00 | Erler, Alexander v Zaitcev, Anton | 3-6,3-6 |
| ITF Egypt F10 | 2018/03/20 08:00 | Lozan, Kristian v Erler, Alexander | 2-6,4-6 |
| ITF Egypt F9 | 2018/03/13 08:00 | Erler, Alexander v Gonzalez, Wilfredo | 4-6,2-6 |
| ITF Egypt F8 | 2018/03/06 08:00 | Erler, Alexander v Geens, Clement | 7-6,2-6,2-6 |
| ITF Egypt F4 | 2018/02/08 08:00 | Erler, Alexander v Barbosa, Romain | 4-6,1-6 |
| ITF Egypt F4 | 2018/02/07 10:45 | Erler, Alexander v Roncalli, Simone | 6-3,4-6,6-2 |
| ITF Greece F4 | 2018/03/18 09:30 | Guy Den Heijer v Duje Ajdukovic | 3-6,6-3,4-6 |
| ITF Greece F4 | 2018/03/17 07:30 | Guy Den Heijer v Caripi, Vasilios | 5-7,6-3,6-4 |
| ITF Greece F3 | 2018/03/15 08:00 | Pauffley, Neil v Guy Den Heijer | 6-4,6-2 |
| ITF Greece F3 | 2018/03/13 10:20 | Jannik Sinner v Guy Den Heijer | 3-6,6-7 |
| ITF Greece F2 | 2018/03/03 07:30 | Guy Den Heijer v Duje Ajdukovic | 3-6,5-7 |
| Spain F4, Singles Qualifying | 2018/02/10 14:30 | Gimeno-Traver, Daniel v Guy Den Heijer | 6-2,7-5 |
| Spain F4, Singles Qualifying | 2018/02/09 15:00 | Guy Den Heijer v Yshai Oliel | 6-1,6-3 |
| Spain F4, Singles Qualifying | 2018/02/08 11:00 | Andrey Chepelev v Guy Den Heijer | 0-6,1-6 |