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