Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF Japan F2 | 2018/03/12 02:30 | Kento Takeuchi v Masaya Kobayashi | 6-3,4-6,6-3 |
| ITF Japan F1 | 2018/03/05 01:00 | Gengo Kikuchi v Masaya Kobayashi | 6-2,7-5 |
| ITF Japan F1 | 2018/03/04 01:00 | Tomohiro Masabayashi v Masaya Kobayashi | 1-6,6-3,5-7 |
| ITF Turkey F7 | 2018/02/21 14:25 | Attila Balazs v Masaya Kobayashi | 6-1,6-3 |
| ITF Turkey F7 | 2018/02/19 07:00 | Masaya Kobayashi v Bogdan Ionut Apostol | 4-6,6-3,4-6 |
| ITF Turkey F7 | 2018/02/18 09:00 | Michiel de Krom v Masaya Kobayashi | 2-6,1-6 |
| ITF Turkey F7 | 2018/02/17 06:30 | Dmitry Myagkov v Masaya Kobayashi | 2-6,3-6 |
| ITF Turkey F6 | 2018/02/12 07:00 | Sho Shimabukuro v Masaya Kobayashi | 6-7,6-3,6-2 |
| ITF Japan F3 | 2018/03/18 01:00 | Soichiro Moritani v Takashi Saito | 6-3,3-6,0-6 |
| ITF Japan F3 | 2018/03/17 04:00 | Kenta Kurita v Takashi Saito | 7-5,3-6,0-6 |
| ITF Japan F2 | 2018/03/13 04:45 | Takashi Saito v Naoki Nakagawa | 4-6,6-3,1-6 |
| ITF Japan F1 | 2018/03/10 02:00 | Takashi Saito v Wishaya Trongcharoenchaikul | 4-6,7-5,4-6 |
| ITF Japan F1 | 2018/03/08 03:10 | Yuichi Ito v Takashi Saito | 2-6,4-6 |
| ITF Japan F1 | 2018/03/07 01:00 | Takashi Saito v Makoto Ochi | 6-3,2-6,6-4 |
| ITF Japan F1 | 2018/03/05 01:00 | Takashi Saito v Itsuki Matsumoto | 6-3,6-4 |
| ITF Japan F1 | 2018/03/03 03:00 | Takashi Saito v Tamaki Yamao | 7-6,6-4 |