Stadion: Court 6 Round: 26 Ground: Clay
| ITF - Niederlande F4 | 2018/08/14 14:15 | Yannick Mertens v Sidane Pontjodikromo | 6-1,4-6,6-4 |
| Challenger - Pullach - Qualifikation | 2018/08/04 15:25 | Yannick Mertens v Steven Diez | 2-6,2-6 |
| Challenger - Astana | 2018/07/17 07:45 | Yannick Mertens v Jurij Rodionov | 5-7,0-6 |
| ITF - Frankreich F13 | 2018/07/13 17:20 | Yannick Mertens v Sora Fukuda | 6-2,3-6,4-6 |
| ITF - Frankreich F13 | 2018/07/12 18:30 | Yannick Mertens v Florian Lakat | 6-3,6-4 |
| ITF - Frankreich F13 | 2018/07/10 13:40 | Yannick Mertens v Hugo Voljacques | 6-2,6-2 |
| Challenger - Recanati - Qualifikation | 2018/07/02 10:00 | Tomas Barrios Vera v Yannick Mertens | 7-6,6-3 |
| Challenger - Recanati - Qualifikation | 2018/07/01 08:00 | Lorenzo Frigerio v Yannick Mertens | 4-6,4-6 |
| ITF - Niederlande F4 | 2018/08/15 12:45 | Justin Butsch v Kazuki Nishiwaki | 6-7,0-6 |
| ITF - Indonesien 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 - Singapur F3 | 2018/05/28 05:00 | Maverick Banes v Kazuki Nishiwaki | 6-7,6-4,7-6 |
| ITF - Singapur F2 | 2018/05/25 03:00 | Kazuki Nishiwaki v Collin Altamirano | 7-5,2-6,3-6 |
| ITF - Singapur F2 | 2018/05/24 04:55 | Kazuki Nishiwaki v Makoto Ochi | 6-2,7-5 |
| ITF - Singapur F2 | 2018/05/23 06:25 | Kazuki Nishiwaki v Calum Puttergill | 6-3,7-6 |
| ITF - Singapur F2 | 2018/05/22 02:00 | Jacob Grills v Kazuki Nishiwaki | 3-6,6-3,5-7 |