Stadium: Court 1 Round: 25 Ground: Clay
| ITF Austria F4 | 2018/07/23 09:00 | Andrzejczuk, Adrian v Press, Frederik | 2-6,3-6 |
| ITF Austria F3 | 2018/07/14 12:30 | Andrzejczuk, Adrian v Fekiac, Martin | 3-6,6-3,3-6 |
| ITF Austria F3 | 2018/07/14 07:15 | Andrzejczuk, Adrian v Torocsik, Adam | 6-2,6-3 |
| ITF Czech Republic F6 | 2018/07/11 08:00 | Paroulek, Tadeas v Andrzejczuk, Adrian | 4-6,6-0,7-6 |
| ITF Czech Republic F6 | 2018/07/10 10:50 | Andrzejczuk, Adrian v Muzaev, Richard | 6-4,7-6 |
| Czech Republic F6, Singles Qualifying | 2018/07/08 10:30 | Andrzejczuk, Adrian v Cintl, Matej | 6-3,6-0 |
| Czech Republic F6, Singles Qualifying | 2018/07/07 09:30 | Andrzejczuk, Adrian v Rajic, Dusan | 6-4,6-3 |
| ITF Vietnam F3 | 2018/05/14 05:05 | Andrzejczuk, Adrian v Halebian, Alexios | 3-6,7-6,5-7 |
| ITF Poland F6 Qual | 2018/08/06 08:00 | Guttau, Niklas v Mlazga, Krzysztof | 6-2,6-4 |
| ITF Poland F6 Qual | 2018/08/05 09:30 | Guttau, Niklas v Iftimie, Michele Lorenzo | 5-7,6-2,6-3 |
| ATP Hamburg Qual | 2018/07/21 12:45 | Jozef Kovalik v Guttau, Niklas | 6-0,6-1 |
| ITF Germany F8 Qual | 2018/07/16 10:30 | Seibert, Tim v Guttau, Niklas | 6-7,7-6,6-2 |
| ITF Germany F8 Qual | 2018/07/15 12:30 | Sudzum, Marcel Marlon v Guttau, Niklas | 4-6,0-6 |
| ITF Germany F8 Qual | 2018/07/15 08:30 | Marlon Vankan v Guttau, Niklas | 1-6,2-6 |
| Challenger Braunschweig Qual | 2018/07/07 09:30 | Kimmer Coppejans v Guttau, Niklas | 6-3,6-1 |
| ITF Germany F4 | 2018/06/19 10:45 | Gonzalez, Wilfredo v Guttau, Niklas | 6-3,7-6 |