Stadium: Court 4 Round: 25 Ground: Clay
| ITF Hong Kong F3 | 2017/07/08 01:30 | Grills, Jacob v Shintaro Imai | 6-7,3-6 |
| ITF Japan F4 | 2018/03/30 01:00 | Kuan-Yi Lee v Shintaro Imai | 6-1,2-6,6-3 |
| ITF Japan F4 | 2018/03/29 04:15 | Naoki Tajima v Shintaro Imai | 4-6,3-6 |
| ITF Japan F4 | 2018/03/27 01:00 | Kawahashi, Yuta v Shintaro Imai | 3-6,3-6 |
| ITF Japan F3 | 2018/03/22 05:25 | Kaito Uesugi v Shintaro Imai | 6-3,2-6,6-1 |
| ITF Japan F3 | 2018/03/19 04:30 | Rio Noguchi v Shintaro Imai | 6-7,4-6 |
| ITF Japan F2 | 2018/03/17 02:00 | Shintaro Imai v Tung-Lin Wu | 5-7,0-6 |
| ITF Japan F2 | 2018/03/16 01:00 | Moritani, Soichiro v Shintaro Imai | 2-6,5-7 |
| ITF Japan F2 | 2018/03/14 01:00 | Rio Noguchi v Shintaro Imai | 3-6,3-6 |
| ITF Japan F4 | 2018/03/30 01:00 | Renta Tokuda v Grills, Jacob | 6-3,6-2 |
| ITF Japan F4 | 2018/03/29 01:00 | Wang, Chuhan v Grills, Jacob | 6-2,3-6,4-6 |
| ITF Japan F4 | 2018/03/27 01:00 | Grills, Jacob v Sekiguchi, Shuichi | 7-6,4-6,6-3 |
| Challenger Qujing Qual | 2018/03/17 02:00 | Wang, Ruixuan v Grills, Jacob | 3-6,7-6,6-2 |
| Shenzhen, China, Qualifying | 2018/03/11 02:45 | Grills, Jacob v Yusuke Takahashi | 4-6,6-4,2-6 |
| Challenger Zhuhai Qual | 2018/03/04 03:45 | Grills, Jacob v Granollers, Gerard | 2-6,6-4,2-6 |
| Challenger Zhuhai Qual | 2018/03/03 05:20 | Grills, Jacob v Jie Cui | 6-4,7-6 |
| Launceston, Australia | 2018/02/04 02:00 | Mitchell, Benjamin v Grills, Jacob | 7-5,6-3 |