Stadium: Court 7 Round: 25 Ground: Clay
| ITF Netherlands F5 | 2018/08/21 08:00 | Kazuki Nishiwaki v Lazov, Alexander | 6-0,2-6,1-6 |
| ITF Netherlands F4 | 2018/08/18 11:00 | Kazuki Nishiwaki v Niels Lootsma | 2-6,2-6 |
| ITF Netherlands F4 | 2018/08/17 09:00 | Kazuki Nishiwaki v Jesper De Jong | 4-3 |
| ITF Netherlands F4 | 2018/08/16 10:30 | Mertens, Yannick v Kazuki Nishiwaki | 3-6,6-7 |
| ITF Netherlands F4 | 2018/08/15 12:45 | Butsch, Justin v Kazuki Nishiwaki | 6-7,0-6 |
| ITF Indonesia F3 | 2018/08/07 04:50 | Kazuki Nishiwaki v Ajeet Rai | 3-6,6-7 |
| ITF Hong Kong F1 | 2018/06/25 03:55 | Kazuki Nishiwaki v Makoto Ochi | 7-6,6-2 |
| ITF Singapore F3 | 2018/05/28 05:00 | Banes, Maverick v Kazuki Nishiwaki | 6-7,6-4,7-6 |
| ITF Netherlands F5 | 2018/08/22 10:00 | Nik Razborsek v Kaczynski, Kevin | 6-4,6-2 |
| ITF Netherlands F5 | 2018/08/21 12:20 | Kaczynski, Kevin v Gerritsen, Stephan | 6-4,1-6,6-2 |
| ITF Netherlands F5 | 2018/08/19 10:00 | Kaczynski, Kevin v Trismen, Harris | 6-0,6-1 |
| ITF Netherlands F5 | 2018/08/18 08:00 | Kaczynski, Kevin v Ruenger, Roman | 6-1,6-0 |
| ITF Germany F11 | 2018/08/09 09:00 | Kaczynski, Kevin v Benjamin Hassan | 2-6,1-6 |
| ITF Germany F11 | 2018/08/08 10:00 | Chaukulkar, Tejas v Kaczynski, Kevin | 3-6,6-4,1-6 |
| ITF Germany F11 | 2018/08/07 11:40 | Baumann, Daniel v Kaczynski, Kevin | 3-6,0-6 |
| ITF Netherlands F3 | 2018/07/10 13:55 | Gerritsen, Stephan v Kaczynski, Kevin | 7-6,2-6,6-1 |