Stadium: Court 11 Round: 26 Ground: Grass
| ITF China F5 | 2016/04/14 03:00 | Issei Okamura v Shuichi Sekiguchi | 2-6,2-6 |
| ITF M25 Mildura | 2019/03/05 23:00 | Issei Okamura v Aaron Addison | 7-5,6-2 |
| ITF M25 Albury | 2019/02/27 23:30 | Issei Okamura v Alexander Crnokrak | 3-6,2-6 |
| ITF M25 Albury | 2019/02/27 02:15 | Colin Sinclair v Issei Okamura | 6-7,6-2,4-6 |
| ITF M25 Albury | 2019/02/25 23:30 | Issei Okamura v Calum Puttergill | 6-3,3-6,10-6 |
| ITF M25 Albury | 2019/02/24 23:30 | Issei Okamura v Mislav Bosnjak | 6-2,7-6 |
| ITF M15 Anning | 2019/01/10 04:30 | Issei Okamura v Naoki Tajima | 6-4,3-6,4-6 |
| ITF M15 Anning | 2019/01/08 02:30 | Ti Chen v Issei Okamura | 2-6,5-7 |
| ITF M15 Anning | 2019/01/01 04:40 | Tao Mu v Issei Okamura | 3-6,6-2,7-5 |
| ITF M25 Mildura | 2019/03/05 01:30 | Alexis Canter v Shuichi Sekiguchi | 6-7,1-6 |
| ITF M25 Albury | 2019/03/02 00:00 | Brydan Klein v Shuichi Sekiguchi | 6-3,6-2 |
| ITF M25 Albury | 2019/02/28 23:30 | Shuichi Sekiguchi v Thomas Fancutt | 5-7,6-1,6-4 |
| ITF M25 Albury | 2019/02/28 01:20 | Shuichi Sekiguchi v Vincent Stouff | 4-6,6-1,6-2 |
| ITF M25 Albury | 2019/02/26 01:05 | Shuichi Sekiguchi v Alexis Canter | 6-2,6-1 |
| Challenger Da Nang | 2019/01/06 03:00 | Viktor Durasovic v Shuichi Sekiguchi | 6-3,6-2 |
| ITF M25 Hongkong | 2019/01/02 02:55 | Shuichi Sekiguchi v Carlos Boluda-Purkiss | 5-7,4-6 |
| Challenger Kobe | 2018/11/13 07:50 | Jordi Samper-Montana v Shuichi Sekiguchi | 6-4,6-1 |