Stadium: Court 1 Round: 45 Ground: Hardcourt outdoor
| ITF Japan F8 | 2016/06/15 04:30 | Ryota Tanuma v Sho Katayama | 3-6,1-6 |
| ITF M15 Nishi-Tokyo | 2019/03/11 01:00 | Ryota Tanuma v Shao-Fan Liu | 7-6,6-3 |
| ITF M25 Mildura | 2019/03/05 02:25 | Alec Adamson v Ryota Tanuma | 2-6,6-1,7-6 |
| ITF M25 Albury | 2019/02/28 01:45 | Brydan Klein v Ryota Tanuma | 6-3,6-2 |
| ITF M25 Albury | 2019/02/27 04:50 | Ryota Tanuma v Chanchai Sookton-Eng | 3-6,7-6,6-2 |
| ITF M15 Sharm El Sheikh | 2019/02/19 08:00 | Michael Geerts v Ryota Tanuma | 6-3,6-1 |
| ITF Hong Kong F3 | 2018/12/25 02:00 | Jumpei Yamasaki v Ryota Tanuma | 4-6,7-6,6-4 |
| ITF Thailand F9 | 2018/11/15 03:00 | Yu Hsiou Hsu v Ryota Tanuma | 6-0,6-2 |
| ITF Thailand F9 | 2018/11/14 06:25 | Antoine Bellier v Ryota Tanuma | 4-6,4-6 |
| ITF M15 Nishi-Tokyo | 2019/03/11 01:00 | Shota Tange v Sho Katayama | 3-6,3-6 |
| ITF M15 Nishi-Tama | 2019/03/07 04:00 | Shintaro Imai v Sho Katayama | 6-2,6-3 |
| ITF M15 Nishi-Tama | 2019/03/06 02:25 | Sho Katayama v Yuta Kawahashi | 6-3,6-1 |
| ITF M15 Nishi-Tama | 2019/03/05 03:00 | Sho Katayama v Yuta Kawahashi | 4-6,5-7 |
| ITF M15 Nishi-Tama | 2019/03/05 01:00 | Sho Katayama v Masayoshi Ono | 6-4,6-4 |
| ITF Canada F7 | 2018/09/12 14:00 | Jack Findel-Hawkins v Sho Katayama | 6-3,6-3 |
| ITF Canada F7 | 2018/09/11 19:45 | Emmett Ward v Sho Katayama | 1-6,1-6 |
| ITF Canada F6 | 2018/09/04 17:00 | Alafia Ayeni v Sho Katayama | 6-2,6-7,6-4 |