Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF Japan F2 | 2018/03/12 02:30 | Takeuchi, Kento (1987) v Masaya Kobayashi | 6-3,4-6,6-3 |
| ITF Japan F1 | 2018/03/05 01:00 | Kikuchi, Gengo 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 | Balazs, Attila v Masaya Kobayashi | 6-1,6-3 |
| ITF Turkey F7 | 2018/02/19 07:00 | Masaya Kobayashi v Apostol, Bogdan Ionut | 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 | Myagkov, Dmitry v Masaya Kobayashi | 2-6,3-6 |
| Turkey F6, Singles Qualifying | 2018/02/12 07:00 | Sho Shimabukuro v Masaya Kobayashi | 6-7,6-3,6-2 |
| ITF Japan F3 | 2018/03/18 01:00 | Moritani, Soichiro v Saito, Takashi | 6-3,3-6,0-6 |
| ITF Japan F3 | 2018/03/17 04:00 | Kurita, Kenta v Saito, Takashi | 7-5,3-6,0-6 |
| ITF Japan F2 | 2018/03/13 04:45 | Saito, Takashi v Naoki Nakagawa | 4-6,6-3,1-6 |
| ITF Japan F1 | 2018/03/10 02:00 | Saito, Takashi v Wishaya Trongcharoenchaikul | 4-6,7-5,4-6 |
| ITF Japan F1 | 2018/03/08 03:10 | Ito, Yuichi v Saito, Takashi | 2-6,4-6 |
| ITF Japan F1 | 2018/03/07 01:00 | Saito, Takashi v Makoto Ochi | 6-3,2-6,6-4 |
| ITF Japan F1 | 2018/03/05 01:00 | Saito, Takashi v Matsumoto, Itsuki | 6-3,6-4 |
| ITF Japan F1 | 2018/03/03 03:00 | Saito, Takashi v Tamaki Yamao | 7-6,6-4 |