Round: 26 Ground: Clay
| ITF Guam F1 | 2016/05/27 05:45 | Kikuchi, Gengo v Sekiguchi, Shuichi | 6-7,6-7 |
| ITF Japan F1 | 2016/03/12 05:30 | Kikuchi, Gengo v Sekiguchi, Shuichi | 7-6,6-1 |
| ITF Japan F6 | 2017/05/29 04:20 | Kishi, Ryota v Kikuchi, Gengo | 7-6,3-6,2-6 |
| ITF Japan F5 | 2017/04/05 02:10 | Kikuchi, Gengo v Shintaro Imai | 4-6,6-4,3-6 |
| ITF Japan F5 | 2017/04/03 02:45 | Takeshima, Shunrou v Kikuchi, Gengo | 0-6,4-6 |
| ITF Japan F4 | 2017/03/30 01:00 | Hong, Seong Chan v Kikuchi, Gengo | 6-3,6-3 |
| ITF Japan F4 | 2017/03/29 01:00 | Kikuchi, Gengo v Itsusaki, Kaito | 6-4,6-3 |
| ITF Japan F3 | 2017/03/22 00:30 | Yusuke Takahashi v Kikuchi, Gengo | 6-3,6-1 |
| ITF Japan F2 | 2017/03/15 03:55 | Kikuchi, Gengo v Furuta, Ibuki | 0-6,6-3,3-6 |
| ITF Japan F2 | 2017/03/14 06:05 | Kikuchi, Gengo v Sano, Koichi | 6-2,6-4 |
| ITF Japan F6 | 2017/05/29 05:55 | Yuki Mochizuki v Sekiguchi, Shuichi | 3-6,4-6 |
| Challenger Seoul | 2017/05/09 04:00 | Duckhee Lee v Sekiguchi, Shuichi | 6-0,6-3 |
| Challenger Seoul Qual | 2017/05/08 02:00 | Glasspool, Lloyd v Sekiguchi, Shuichi | 3-6,3-6 |
| Challenger Seoul Qual | 2017/05/07 04:20 | Makoto Ochi v Sekiguchi, Shuichi | 1-6,1-6 |
| Challenger Seoul Qual | 2017/05/06 06:05 | Kim, Yu-Seob v Sekiguchi, Shuichi | 1-6,4-6 |
| Challenger - Taipei | 2017/04/18 06:20 | Sekiguchi, Shuichi v Skugor, Franko | 1-6,4-6 |
| ITF China F5 | 2017/04/15 05:35 | Mousley, Bradley v Sekiguchi, Shuichi | 7-6,7-6 |
| ITF China F5 | 2017/04/13 05:05 | Yang, Tsung-Hua v Sekiguchi, Shuichi | 2-6,4-6 |