Stadium: Court 6 Round: 27
| ITF Vietnam F2 | 2018/05/07 03:00 | Takashi Saito v Soichiro Moritani | 7-6,3-6,6-3 |
| ITF Japan F3 | 2018/03/18 01:00 | Soichiro Moritani v Takashi Saito | 6-3,3-6,0-6 |
| ITF Thailand F3 | 2018/09/05 04:45 | Soichiro Moritani v Kittirat Kerdlaphee | 6-2,6-7,6-4 |
| ITF Thailand F3 | 2018/09/04 07:45 | Soichiro Moritani v Natthasith Kunsuwan | 6-2,6-2 |
| ITF Thailand F2 | 2018/08/27 07:10 | Ryota Tanuma v Soichiro Moritani | 6-2,7-6 |
| ITF Indonesia F3 | 2018/08/07 05:05 | Daniel Nolan v Soichiro Moritani | 7-6,6-2 |
| ITF Chinese Taipei F1 | 2018/07/17 02:00 | Yuttana Charoenphon v Soichiro Moritani | 5-7,4-6 |
| ITF Malaysia F2 | 2018/07/13 03:00 | Soichiro Moritani v Gabriel Petit | 6-7,6-0,3-6 |
| ITF Malaysia F2 | 2018/07/12 03:00 | David Perez Sanz v Soichiro Moritani | 5-7,2-6 |
| ITF Malaysia F2 | 2018/07/11 02:00 | Michael Look v Soichiro Moritani | 4-6,5-7 |
| ITF Thailand F3 | 2018/09/05 04:00 | Yuichi Ito v Takashi Saito | 2-6,6-4,3-6 |
| ITF Thailand F3 | 2018/09/04 06:55 | Palaphoom Kovapitukted v Takashi Saito | 6-4,4-6,2-6 |
| ITF Thailand F2 | 2018/08/29 04:00 | Takashi Saito v Connor Farren | 6-2,6-1 |
| ITF Thailand F2 | 2018/08/28 07:10 | Takashi Saito v Pol Wattanakul | 6-3,3-6,6-3 |
| Challenger Meerbusch Qual | 2018/08/12 14:25 | Takashi Saito v Alexandre Muller | 3-6,0-6 |
| ITF Belgium F7 | 2018/08/09 09:20 | Takashi Saito v Benjamin Pietri | 6-7,4-6 |
| ITF Belgium F7 | 2018/08/07 16:35 | Takashi Saito v Vadym Ursu | 6-7,6-3,7-6 |
| ITF Germany F10 | 2018/07/31 10:00 | Manuel Guinard v Takashi Saito | 7-6,0-6,6-1 |