Stadium: Court 1 Round: 28 Ground: Hardcourt outdoor
| 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 M15 Karuizawa | 2019/06/01 02:00 | Ko Suzuki v Soichiro Moritani | 6-4,6-2 |
| ITF M15 Karuizawa | 2019/05/31 01:00 | Ko Suzuki v Goran Markovic | 6-1,6-4 |
| ITF M15 Karuizawa | 2019/05/30 06:00 | Jordi Samper-Montana v Ko Suzuki | 4-6,6-0,6-7 |
| ITF M15 Karuizawa | 2019/05/28 05:35 | Yuta Kikuchi v Ko Suzuki | 2-6,6-3,4-6 |
| ITF M15 Guam | 2019/06/07 01:35 | Sho Katayama v Hiroyasu Ehara | 3-6,4-6 |
| ITF M15 Guam | 2019/06/06 01:25 | Jake Delaney v Hiroyasu Ehara | 2-6,3-6 |
| ITF M15 Guam | 2019/06/05 05:35 | Jurence Zosimo Mendoza v Hiroyasu Ehara | 4-6,4-6 |
| ITF M25 Nonthaburi | 2019/05/23 06:05 | Rio Noguchi v Hiroyasu Ehara | 7-5,6-2 |
| ITF M25 Nonthaburi | 2019/05/22 08:05 | Hiroyasu Ehara v Alexander Crnokrak | 7-5,6-2 |
| ITF M25 Luan | 2019/05/14 05:15 | Hiroyasu Ehara v Issei Okamura | 4-6,2-6 |
| ITF M25 Wuhan | 2019/05/09 02:00 | Wishaya Trongcharoenchaikul v Hiroyasu Ehara | 7-6,6-7,7-5 |
| ITF M25 Wuhan | 2019/05/08 04:20 | Chukang Wang v Hiroyasu Ehara | 0-6,4-6 |