Stadium: Court 6 Round: 26 Ground: Synthetic outdoor
| Akishima, Singles M-ITF-JPN-08A | 2019/06/12 02:35 | Okagaki, Kosuke v Tamaki Yamao | 6-3,6-1 |
| Akishima, Singles M-ITF-JPN-08A | 2019/06/11 05:00 | Takeshima, Shunrou v Okagaki, Kosuke | 2-6,2-6 |
| Akishima, Singles M-ITF-JPN-08A | 2019/06/11 00:00 | Okagaki, Kosuke v Sam Ryan Ziegann | 6-1,6-0 |
| ITF - M15 Antalya | 2019/04/01 07:00 | Dan Alexandru Tomescu v Okagaki, Kosuke | 6-3,6-4 |
| ITF - M15 Antalya | 2019/03/26 07:00 | Okagaki, Kosuke v Wilson Leite | 5-7,7-5,2-6 |
| ITF - M15 Antalya | 2019/03/11 07:15 | Okagaki, Kosuke v Louroi Martinez | 3-6,6-2,5-10 |
| ITF - M15 Antalya | 2019/02/25 14:45 | Mircea-Alexandru Jecan v Okagaki, Kosuke | 6-4,6-0 |
| ITF - M15 Antalya | 2019/02/25 07:00 | Okagaki, Kosuke v Thiem, Moritz | 3-6,7-6,10-3 |
| Akishima, Singles M-ITF-JPN-08A | 2019/06/12 01:00 | Katayama, Sho v Takeuchi, Kento (1987) | 6-0,6-4 |
| Guam, Singles M-ITF-GUM-01A | 2019/06/07 01:35 | Katayama, Sho v Ehara, Hiroyasu | 3-6,4-6 |
| Guam, Singles M-ITF-GUM-01A | 2019/06/06 00:00 | Katayama, Sho v Takeda, Naoki | 7-6,6-1 |
| Guam, Singles M-ITF-GUM-01A | 2019/06/04 01:55 | Katayama, Sho v Tomohiro Masabayashi | 6-4,7-6 |
| Matsuyama, Singles M-ITF-JPN-06A | 2019/04/10 03:30 | Niki, Takuto v Katayama, Sho | 6-2,6-3 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/21 04:40 | Niki, Takuto v Katayama, Sho | 4-6,7-6,6-4 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/20 07:15 | Seita Watanabe v Katayama, Sho | 3-6,2-6 |
| ITF - M15 Nishi-Tokyo | 2019/03/12 03:20 | Tanuma, Ryota v Katayama, Sho | 6-4,2-6,10-5 |