Stadium: C Round: 29
| ITF Singapore F1 | 2018/05/18 03:30 | Nicholas S. Hu v Soichiro Moritani | 3-6,1-6 |
| ITF Singapore F1 | 2018/05/16 04:20 | Soichiro Moritani v Lucas Vuradin | 6-1,1-6,7-6 |
| ITF Singapore F1 | 2018/05/15 02:00 | Soichiro Moritani v Alec Adamson | 6-3,1-6,6-1 |
| ITF Vietnam F2 | 2018/05/07 03:00 | Takashi Saito v Soichiro Moritani | 7-6,3-6,6-3 |
| ITF Vietnam F1 | 2018/04/30 03:00 | Soichiro Moritani v Jirat Navasirisomboon | 2-6,4-6 |
| ITF Japan F6 | 2018/04/10 02:25 | Hiroki Moriya v Soichiro Moritani | 6-4,7-5 |
| ITF Japan F5 | 2018/04/02 02:20 | Jumpei Yamasaki v Soichiro Moritani | 6-1,6-3 |
| ITF Japan F4 | 2018/03/26 01:00 | Soichiro Moritani v Shinta Fujii | 6-4,3-6,3-6 |
| ITF Singapore F1 | 2018/05/17 03:00 | Kaito Uesugi v Thai-Son Kwiatkowski | 2-6,7-5,1-6 |
| ITF Singapore F1 | 2018/05/16 02:00 | Shunrou Takeshima v Thai-Son Kwiatkowski | 4-6,6-4,2-6 |
| ITF Singapore F1 | 2018/05/15 04:25 | Michael Look v Thai-Son Kwiatkowski | 0-6,5-7 |
| Challenger Marbella Qual | 2018/03/24 09:15 | Marco Trungelliti v Thai-Son Kwiatkowski | 6-7,7-5,6-1 |
| Challenger Dallas | 2018/01/30 19:55 | Thai-Son Kwiatkowski v Reilly Opelka | View |
| Challenger Newport Beach | 2018/01/24 21:45 | Taylor Fritz v Thai-Son Kwiatkowski | 6-4,6-4 |
| Challenger Newport Beach | 2018/01/22 21:15 | Marcelo Arevalo v Thai-Son Kwiatkowski | 4-6,4-6 |
| ITF Mexico F7 | 2017/12/02 17:00 | Thai-Son Kwiatkowski v Marc-Andrea Huesler | 3-6,4-6 |