Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Guam | 2019/06/07 00:00 | Soichiro Moritani v Ko Suzuki | 3-6,4-6 |
| ITF M15 Karuizawa | 2019/06/01 02:00 | Ko Suzuki v Soichiro Moritani | 6-4,6-2 |
| ITF Japan F2 | 2015/03/17 05:25 | Ko Suzuki v Soichiro Moritani | 6-3,3-6,2-6 |
| ITF M15 Akishima | 2019/06/12 02:30 | Rio Noguchi v Ko Suzuki | 6-3,1-6,6-3 |
| ITF M15 Akishima | 2019/06/11 03:00 | Ko Suzuki v Kazuki Shimizu | 7-5,6-3 |
| ITF M15 Akishima | 2019/06/11 00:00 | Masayoshi Ono v Ko Suzuki | 2-6,3-6 |
| ITF M15 Guam | 2019/06/08 00:00 | Ko Suzuki v Hiroyasu Ehara | 4-6,1-6 |
| ITF M15 Guam | 2019/06/07 00:00 | Soichiro Moritani v Ko Suzuki | 3-6,4-6 |
| ITF M15 Guam | 2019/06/06 01:20 | Ko Suzuki v Karunuday Singh | 3-6,7-6,6-3 |
| ITF M15 Guam | 2019/06/05 02:40 | Ko Suzuki v Joseph W. Van Meter | 6-2,6-4 |
| ITF M15 Karuizawa | 2019/06/02 02:00 | Ko Suzuki v Yuki Mochizuki | 4-6,6-4,2-6 |
| ITF M25 Kunshan | 2019/07/04 01:30 | Soichiro Moritani v Fajing Sun | 1-6,0-6 |
| ITF M25 Kunshan | 2019/07/03 01:30 | Sheng Hao Zhou v Soichiro Moritani | 3-6,4-6 |
| ITF M15 Akishima | 2019/06/12 01:00 | Soichiro Moritani v Haru Inoue | 0-6,2-6 |
| ITF M15 Guam | 2019/06/07 00:00 | Soichiro Moritani v Ko Suzuki | 3-6,4-6 |
| ITF M15 Guam | 2019/06/06 00:00 | Soichiro Moritani v Sam Ryan Ziegann | 6-2,6-2 |
| ITF M15 Guam | 2019/06/05 01:10 | Soichiro Moritani v Camden Camacho | 6-0,6-0 |
| ITF M15 Karuizawa | 2019/06/01 02:00 | Ko Suzuki v Soichiro Moritani | 6-4,6-2 |
| ITF M15 Karuizawa | 2019/05/31 01:00 | Kento Takeuchi v Soichiro Moritani | 3-6,3-6 |