Round: 25 Ground: Hardcourt outdoor
| ITF Qatar F4 | 2015/12/01 10:30 | Ryota Tanuma v Yecong He | 6-7,1-6 |
| ITF Australia F9 | 2015/10/21 04:25 | Luke Saville v Ryota Tanuma | 6-3,6-3 |
| ITF Australia F8 | 2015/10/13 00:00 | Ryota Tanuma v Blake Mott | 3-6,2-6 |
| ITF Chinese Taipei F1 | 2015/08/27 02:00 | Chu-Huan Yi v Ryota Tanuma | 7-6,3-6,6-1 |
| ITF Chinese Taipei F1 | 2015/08/25 05:30 | Ryota Tanuma v Chien Hsun Lo | 6-1,6-2 |
| ITF Chinese Taipei F1 | 2015/08/21 02:00 | Issei Okamura v Ryota Tanuma | 6-4,3-6,6-3 |
| ITF Chinese Taipei F1 | 2015/08/20 03:35 | Ryota Tanuma v Tung-Lin Wu | 6-3,6-3 |
| ITF Thailand F9 | 2015/08/13 03:00 | Ti Chen v Ryota Tanuma | 6-4,6-3 |
| Challenger Shanghai | 2015/10/10 05:40 | Nikoloz Basilashvili v Shuichi Sekiguchi | 6-4,6-2 |
| WTA Kuala Lumpur Qual | 2015/09/26 02:00 | Andre Begemann v Shuichi Sekiguchi | 2-6,6-2,6-3 |
| Challenger Kaohsiung Qual | 2015/09/20 06:50 | Shuichi Sekiguchi v Chu-Huan Yi | 4-6,4-6 |
| Challenger Granby | 2015/07/23 15:00 | Shuichi Sekiguchi v Matteo Donati | 4-6,1-6 |
| ITF Thailand F9 | 2015/06/27 03:00 | Christopher Rungkat v Shuichi Sekiguchi | 6-4,6-3 |
| ITF Thailand F9 | 2015/06/26 03:00 | Shuichi Sekiguchi v Jung-Woong Na | 6-4,6-3 |
| ITF Thailand F9 | 2015/06/25 03:00 | Shuichi Sekiguchi v Karunuday Singh | 6-0,6-2 |
| ITF Thailand F9 | 2015/06/24 05:00 | Shuichi Sekiguchi v Warit Sornbutnark | 6-4,6-3 |