| Challenger Shanghai | 2016/09/08 01:10 | Shuichi Sekiguchi v Blaz Kavcic | 5-7,3-6 |
| Challenger Shanghai Qual | 2016/09/05 02:00 | Edan Leshem v Shuichi Sekiguchi | 4-6,4-6 |
| Challenger Shanghai Qual | 2016/09/04 03:45 | Xi Qi v Shuichi Sekiguchi | 4-6,2-6 |
| Challenger Bangkok 4 | 2016/08/30 09:15 | Shuichi Sekiguchi v Zhe Li | 6-7,3-6 |
| Challenger Astana 2 | 2016/07/25 09:25 | Shuichi Sekiguchi v Miki Jankovic | 1-6,2-6 |
| ITF Japan F6 | 2016/06/04 01:00 | Shuichi Sekiguchi v Yasutaka Uchiyama | 3-6,3-6 |
| ITF Japan F6 | 2016/06/03 03:15 | Yuichi Ito v Shuichi Sekiguchi | 1-6,2-6 |
| ITF Japan F6 | 2016/06/01 01:00 | Evan Song v Shuichi Sekiguchi | 3-6,1-6 |
| ITF Korea F8 | 2016/09/07 04:35 | Keisuke Numajiri v Jeamoon Lee | 1-6,1-6 |
| ITF Korea F8 | 2016/09/06 04:00 | Katsuki Nagao v Keisuke Numajiri | 6-3,4-6,0-6 |
| ITF Korea F8 | 2016/09/04 02:00 | Keisuke Numajiri v Gwang Hyeon Cho | 6-1,6-4 |
| ITF Korea F8 | 2016/08/28 02:00 | Keisuke Numajiri v Woo Hyeok Jang | 3-6,1-6 |
| ITF Spain F26 Qual | 2016/08/14 08:30 | Keisuke Numajiri v Aitor S Llopis | 2-6,4-6 |
| ITF Spain F25 | 2016/08/09 10:00 | Benjamin Bonzi v Keisuke Numajiri | 6-0,6-4 |
| ITF Spain F24 | 2016/08/03 20:15 | Sebastien Boltz v Keisuke Numajiri | 6-2,7-5 |
| ITF Spain F24 | 2016/08/01 09:00 | Keisuke Numajiri v Boris Arias | 6-4,7-6 |