Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| Challenger Kobe | 2018/11/10 03:35 | Tamaki Yamao v Naoki Tajima | 4-6,5-7 |
| ITF - M15 Kashiwa | 2019/04/01 00:00 | Ryota Tanuma v Tamaki Yamao | 6-7,4-6 |
| ITF - M15 Kashiwa | 2019/04/01 00:00 | Tamaki Yamao v Veldheer, Mick | 6-1,6-4 |
| ITF - M15 Tsukuba | 2019/03/25 04:30 | Veldheer, Mick v Tamaki Yamao | 6-1,6-3 |
| ITF - M15 Tsukuba | 2019/03/25 01:00 | Tamaki Yamao v Ng, Hao Yuan | 6-3,6-2 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/21 02:00 | Ehara, Hiroyasu v Tamaki Yamao | 6-3,4-6,6-0 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/20 01:00 | Tamaki Yamao v Look, Michael | 6-2,6-3 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/18 06:30 | Tamaki Yamao v Yeung, Pak Long | 6-3,6-7,10-6 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/18 03:00 | Ito, Yuichi v Tamaki Yamao | 2-6,3-6 |
| 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 |
| Nishi-Tama, Simples M-ITF-JPN-01A | 2019/03/08 04:30 | Sho Shimabukuro v Naoki Tajima | 6-3,7-5 |