Stadium: Court 2 Round: 27 Ground: Hardcourt outdoor
| ITF Hong Kong F5 | 2016/12/29 23:00 | Sekiguchi, Shuichi v Shintaro Imai | 7-6,6-3 |
| ITF - M15 Nishi-Tokyo | 2019/03/14 03:45 | Sekiguchi, Shuichi v Yuki Mochizuki | 6-2,6-1 |
| ITF - M15 Nishi-Tokyo | 2019/03/13 01:00 | Sekiguchi, Shuichi v Keisuke Saitoh | 6-3,6-2 |
| ITF - M25 Mildura | 2019/03/09 01:00 | Sekiguchi, Shuichi v Klein, Brydan | 7-6,1-6,1-6 |
| ITF - M25 Mildura | 2019/03/08 02:40 | Yuta Shimizu v Sekiguchi, Shuichi | 3-6,3-6 |
| ITF - M25 Mildura | 2019/03/07 02:00 | Issei Okamura v Sekiguchi, Shuichi | 3-6,6-3,2-6 |
| ITF - M25 Mildura | 2019/03/05 01:30 | Alexis Canter v Sekiguchi, Shuichi | 6-7,1-6 |
| Albury, Simples M-ITF-AUS-01A | 2019/03/02 00:00 | Klein, Brydan v Sekiguchi, Shuichi | 6-3,6-2 |
| Albury, Simples M-ITF-AUS-01A | 2019/02/28 23:30 | Sekiguchi, Shuichi v Thomas Fancutt | 5-7,6-1,6-4 |
| ITF - M15 Nishi-Tokyo | 2019/03/14 01:00 | Shintaro Imai v Jumpei Yamasaki | 3-6,6-3,6-3 |
| ITF - M15 Nishi-Tokyo | 2019/03/13 03:50 | Shintaro Imai v Naoki Tajima | 6-1,6-4 |
| Nishi-Tama, Simples M-ITF-JPN-01A | 2019/03/10 01:00 | Shintaro Imai v Nam, Ji Sung | 6-2,6-2 |
| Nishi-Tama, Simples M-ITF-JPN-01A | 2019/03/09 01:00 | Shintaro Imai v Sho Shimabukuro | 6-4,6-3 |
| Nishi-Tama, Simples M-ITF-JPN-01A | 2019/03/08 04:10 | Shintaro Imai v Tomohiro Masabayashi | 6-3,6-2 |
| Nishi-Tama, Simples M-ITF-JPN-01A | 2019/03/07 04:00 | Shintaro Imai v Katayama, Sho | 6-2,6-3 |
| Nishi-Tama, Simples M-ITF-JPN-01A | 2019/03/05 03:30 | Yusuke Takahashi v Shintaro Imai | 1-6,7-5,3-6 |
| Challenger Yokohama | 2019/02/26 01:00 | Shintaro Imai v Perez Sanz, David | 2-6,3-6 |