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