Stadium: Court 1 Round: 26
| ITF M15 Anning | 2019/01/08 02:30 | Ti Chen v Issei Okamura | 2-6,5-7 |
| ITF M15 Anning | 2019/01/01 04:40 | Tao Mu v Issei Okamura | 3-6,6-2,7-5 |
| ITF Hong Kong F3 | 2018/12/26 03:00 | Riccardo Bonadio v Issei Okamura | 6-3,7-5 |
| ITF Hong Kong F3 | 2018/12/25 09:35 | Issei Okamura v Yuki Mochizuki | 7-6,7-6 |
| ITF Hong Kong F3 | 2018/12/24 02:00 | Issei Okamura v Taisei Ichikawa | 6-2,7-5 |
| ITF Hong Kong F3 | 2018/12/22 02:00 | Issei Okamura v Kyle Lok Yin Tang | 6-1,6-1 |
| Challenger Kobe | 2018/11/11 03:35 | Jacob Grills v Issei Okamura | 1-6,6-4,6-3 |
| Challenger Kobe | 2018/11/10 03:25 | Yuichi Ito v Issei Okamura | 4-6,7-6,3-6 |
| ITF M15 Anning | 2019/01/09 07:55 | Ye Cong Mo v Naoki Tajima | 6-3,4-6,3-6 |
| Challenger Kobe | 2018/11/11 02:00 | Naoki Tajima v Aleksandar Vukic | 6-3,6-7,5-7 |
| Challenger Kobe | 2018/11/10 03:35 | Tamaki Yamao v Naoki Tajima | 4-6,5-7 |
| ITF Japan F8 | 2018/06/13 01:00 | Kaito Uesugi v Naoki Tajima | 2-6,6-3,6-3 |
| ITF Japan F6 | 2018/04/13 01:30 | Naoki Tajima v Makoto Ochi | 4-6,6-1,0-6 |
| ITF Japan F6 | 2018/04/12 03:50 | Shunrou Takeshima v Naoki Tajima | 6-4,2-6,4-6 |
| ITF Japan F6 Qual | 2018/04/10 01:00 | Yuki Yudate v Naoki Tajima | 2-6,0-6 |
| ITF Japan F5 | 2018/04/04 05:10 | Naoki Tajima v Yusuke Takahashi | 4-6,2-6 |