Round: 25 Ground: Clay
| Challenger Quanzhou | 2017/03/21 04:50 | Yuki Bhambri v Tatsuma Ito | 7-6,6-2 |
| Challenger Shenzhen | 2017/03/14 06:00 | Duckhee Lee v Tatsuma Ito | 6-1,5-7,6-4 |
| Challenger Yokohama | 2017/03/04 05:50 | Tatsuma Ito v Soonwoo Kwon | 4-6,4-6 |
| Challenger Yokohama | 2017/03/03 05:00 | Kaito Uesugi v Tatsuma Ito | 7-6,2-6,6-7 |
| Challenger Yokohama | 2017/03/03 01:00 | Tatsuma Ito v Go Soeda | 6-4,6-1 |
| Challenger Yokohama | 2017/02/28 03:35 | Joris De Loore v Tatsuma Ito | 6-7,1-6 |
| Challenger Kyoto | 2017/02/21 01:30 | Tatsuma Ito v Shuichi Sekiguchi | 6-2,6-3 |
| ATP Memphis Qual | 2017/02/12 00:30 | James McGee v Tatsuma Ito | 6-4,6-7,1-6 |
| ITF Japan F5 | 2017/04/01 02:00 | Katsuki Nagao v Kazuki Shimizu | 6-3,6-3 |
| ITF Japan F4 | 2017/03/28 01:00 | Katsuki Nagao v Shunrou Takeshima | 2-6,2-6 |
| ITF Japan F4 | 2017/03/26 00:59 | Katsuki Nagao v Nasa Hatakeyama | 6-2,6-3 |
| ITF Japan F4 | 2017/03/25 01:00 | Katsuki Nagao v Ryohei Tagata | 2-6,6-2,6-0 |
| ITF Japan F3 | 2017/03/19 01:00 | Jeamoon Lee v Katsuki Nagao | 7-6,6-4 |
| ITF Japan F3 | 2017/03/18 08:00 | Masamichi Imamura v Katsuki Nagao | 2-6,1-6 |
| ITF Japan F3 | 2017/03/18 05:00 | Ryohei Tagata v Katsuki Nagao | 3-6,3-6 |
| ITF Japan F1 | 2017/03/06 01:00 | Katsuki Nagao v Sho Shimabukuro | 3-6,6-7 |