Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| Challenger Shenzhen | 2018/03/17 03:00 | Tatsuma Ito v Ilya Ivashka | 3-6,2-6 |
| Challenger Shenzhen | 2018/03/16 05:05 | Jurgen Zopp v Tatsuma Ito | 3-6,4-6 |
| Challenger Shenzhen | 2018/03/15 09:35 | Tatsuma Ito v Uladzimir Ignatik | 1-6,6-3,6-4 |
| Challenger Shenzhen | 2018/03/13 07:20 | Di Wu v Tatsuma Ito | 6-7,7-5,5-7 |
| Challenger Zhuhai | 2018/03/06 06:55 | Tatsuma Ito v Stefano Napolitano | 3-6,3-6 |
| Challenger Yokohama | 2018/03/04 02:30 | Yasutaka Uchiyama v Tatsuma Ito | 2-6,6-3,6-4 |
| Challenger Yokohama | 2018/03/02 02:00 | Tatsuma Ito v Hiroki Moriya | 6-3,6-3 |
| Challenger Yokohama | 2018/02/28 03:55 | Tatsuma Ito v Jason Kubler | 3-6,6-3,7-6 |
| ITF Japan F2 | 2018/03/16 03:10 | Tung-Lin Wu v Naoki Nakagawa | 6-3,4-6,6-2 |
| ITF Japan F2 | 2018/03/14 02:50 | Naoki Nakagawa v Yuta Shimizu | 4-6,6-3,6-2 |
| ITF Japan F2 | 2018/03/13 04:45 | Takashi Saito v Naoki Nakagawa | 4-6,6-3,1-6 |
| ITF Japan F1 | 2018/03/09 02:00 | Naoki Nakagawa v Daniel Nguyen | 6-3,3-6,5-7 |
| ITF Japan F1 | 2018/03/08 01:30 | Naoki Nakagawa v Gengo Kikuchi | 7-5,7-6 |
| ITF Japan F1 | 2018/03/06 02:00 | Naoki Nakagawa v Shin Yoshida | 6-4,6-1 |
| Challenger Kyoto Qual | 2018/02/18 02:45 | Naoki Nakagawa v Ko Suzuki | 6-7,6-7 |
| Challenger Kyoto Qual | 2018/02/17 02:25 | Hiroki Moriya v Naoki Nakagawa | 6-4,6-7,2-6 |