Stadium: C.2 Round: 27 Ground: Synthetic outdoor
| Akishima, Singles M-ITF-JPN-08A | 2019/06/13 02:45 | Inoue, Haru v Tagata, Ryohei | 6-4,3-6,2-6 |
| Akishima, Singles M-ITF-JPN-08A | 2019/06/12 01:00 | Tagata, Ryohei v Kurita, Kenta | 6-2,6-3 |
| ITF - M15 Tsukuba | 2019/03/28 02:10 | Tagata, Ryohei v Niki, Takuto | 3-6,6-2,7-5 |
| ITF - M15 Tsukuba | 2019/03/26 01:00 | Tagata, Ryohei v Kawahashi, Yuta | 4-6,6-2,6-1 |
| ITF Japan F4 | 2018/03/27 02:30 | Tagata, Ryohei v Yuta Shimizu | 4-6,4-6 |
| ITF Japan F3 | 2018/03/17 04:00 | Tagata, Ryohei v Sasai, Masaki | 5-7,6-3,2-6 |
| ITF Japan F3 | 2018/03/17 00:30 | Tagata, Ryohei v Takuya Kumasaka | 6-0,6-2 |
| ITF Japan F4 | 2017/03/25 01:00 | Nagao, Katsuki v Tagata, Ryohei | 2-6,6-2,6-0 |
| Akishima, Singles M-ITF-JPN-08A | 2019/06/13 01:00 | Okagaki, Kosuke v Katayama, Sho | 3-6,3-6 |
| 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 |