| ITF Japan F5 | 04/01 02:00 | 54 | Yuichiro Inui v Naoki Tajima | 4-6,0-6 | |
| ITF Japan F4 | 03/29 05:40 | 25 | Naoki Tajima v Yusuke Takahashi | 6-3,1-6,4-6 | |
| Challenger Kyoto Qual | 02/18 04:20 | 45 | Evgeny Karlovskiy v Naoki Tajima | 6-3,6-1 | |
| ITF Japan F1 | 03/05 03:00 | 62 | Tung-Lin Wu v Naoki Tajima | 6-4,5-7,6-4 |