Stadium: Court 14 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Kashiwa | 2019/04/03 03:05 | Tamaki Yamao v Naoki Tajima | 6-1,3-6,6-2 |
| ITF - M15 Tsukuba | 2019/03/30 01:00 | Naoki Tajima v Shintaro Imai | 1-6,2-6 |
| ITF - M15 Tsukuba | 2019/03/29 03:35 | Naoki Tajima v Yuta Shimizu | 6-4,7-6 |
| ITF - M15 Tsukuba | 2019/03/28 03:00 | Mark Whitehouse v Naoki Tajima | 4-6,6-4,3-6 |
| ITF - M15 Tsukuba | 2019/03/27 03:25 | Issei Okamura v Naoki Tajima | 3-6,4-6 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/21 03:40 | Yusuke Takahashi v Naoki Tajima | 6-3,6-2 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/20 02:25 | Naoki Tajima v Tomohiro Masabayashi | 4-6,6-1,6-2 |
| ITF - M15 Nishi-Tokyo | 2019/03/13 03:50 | Shintaro Imai v Naoki Tajima | 6-1,6-4 |
| Matsuyama, Singles M-ITF-JPN-06A | 2019/04/09 03:00 | Congsup Congcar v Kousuke Ogura | 5-7,5-7 |
| ITF - M15 Kashiwa | 2019/04/01 00:00 | Kousuke Ogura v Takeuchi, Kento (1987) | 2-6,4-6 |
| ITF - M15 Tsukuba | 2019/03/25 04:45 | Liu, Shao-Fan v Kousuke Ogura | 7-5,6-7,10-6 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/20 03:30 | Kousuke Ogura v Song, Min-Kyu | 3-6,6-3,3-6 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/18 04:30 | Masamichi Imamura v Kousuke Ogura | 2-6,6-4,10-6 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/18 00:30 | Shimizu, Kazuki v Kousuke Ogura | 6-7,5-7 |
| ITF - M15 Nishi-Tokyo | 2019/03/13 05:55 | Kousuke Ogura v Ryota Tanuma | 2-6,6-7 |
| ITF - M15 Nishi-Tokyo | 2019/03/11 01:00 | Kousuke Ogura v Fujii, Sota | 6-3,2-6,10-8 |