Round: 25 Ground: Clay
| ITF Japan F2 | 2014/03/18 01:00 | Oku, Hiromasa v Niki, Takuto | 6-7,3-6 |
| ITF Guam F1 | 2016/05/27 01:25 | Whittington, Andrew v Niki, Takuto | 4-6,6-4,6-4 |
| ITF Guam F1 | 2016/05/24 06:30 | Oljaca, Mark v Niki, Takuto | 4-6,0-6 |
| ITF Japan F5 | 2016/04/08 06:25 | Niki, Takuto v Katayama, Sho | 7-6,2-6,3-6 |
| ITF Japan F5 | 2016/04/06 03:40 | Niki, Takuto v Ko Suzuki | 6-4,3-6,6-2 |
| ITF Japan F4 | 2016/03/30 01:00 | Niki, Takuto v Ryota Tanuma | 4-6,5-7 |
| ITF Japan F3 | 2016/03/21 03:45 | Gao, Xin v Niki, Takuto | 2-6,6-2,6-2 |
| ITF Japan F2 | 2016/03/15 02:25 | Niki, Takuto v Yunseong Chung | 3-6,6-3,3-6 |
| ITF Japan F1 | 2016/03/12 01:00 | Niki, Takuto v Kikuchi, Gengo | 6-7,6-4,3-6 |
| ITF Guam F1 | 2016/05/24 02:00 | Oku, Hiromasa v Takeshima, Shunrou | 3-6,2-6 |
| ITF Turkey F19 | 2016/05/13 09:20 | Sieber, Marc v Oku, Hiromasa | 6-0,6-3 |
| ITF Turkey F19 | 2016/05/11 13:00 | Oku, Hiromasa v Statzberger, Thomas | 6-3,6-4 |
| ITF Turkey F18 | 2016/05/04 08:00 | Oku, Hiromasa v Yuksel, Anil | 3-6,2-6 |
| Turkey F17, Singles Qualifying | 2016/04/26 11:20 | Altug Celikbilek v Oku, Hiromasa | 6-4,2-6,7-6 |
| ITF Japan F5 | 2016/04/08 01:00 | Oku, Hiromasa v Kibi, Yuya | 2-6,4-6 |
| ITF Japan F5 | 2016/04/05 07:45 | Oku, Hiromasa v Nagao, Katsuki | 7-6,5-7,6-1 |
| ITF Japan F4 | 2016/03/30 03:25 | Shiga, Masato v Oku, Hiromasa | 6-4,6-3 |