Stadium: Court 3 Round: 28 Ground: Hardcourt outdoor
| Challenger Burnie | 2020/01/26 23:00 | Naoki Tajima v Petros Tsitsipas | 4-6,6-4,4-6 |
| Challenger Bendigo | 2020/01/13 04:30 | Naoki Tajima v Maverick Banes | 1-6,2-6 |
| Challenger Bendigo | 2020/01/12 05:45 | Min-Kyu Song v Naoki Tajima | 3-6,4-6 |
| ITF M15 - Hong Kong | 2020/01/08 09:05 | Naoki Tajima v Cing-Yang Meng | 5-7,6-1,2-6 |
| ITF - M15 - Monastir | 2019/11/15 10:45 | Naoki Tajima v Aziz Kijametovic | 2-6,4-6 |
| ITF - M15 - Monastir | 2019/11/14 08:30 | Naoki Tajima v Jake Hersey | 6-2,6-3 |
| ITF - M15 - Monastir | 2019/11/13 09:00 | Naoki Tajima v Clement Geens | 3-6,6-3,7-5 |
| ITF - M15 - Monastir | 2019/11/07 12:35 | Naoki Tajima v Majed Kilani | 3-6,3-6 |
| ITF M15 - Hong Kong | 2020/01/09 03:25 | Makoto Ochi v Ryota Tanuma | 6-4,6-4 |
| ITF M15 - Hong Kong | 2020/01/08 09:00 | Ryota Tanuma v Hanyi Liu | 6-2,6-3 |
| ITF M15 - Nonthaburi | 2019/11/27 02:30 | Keisuke Saitoh v Ryota Tanuma | 6-2,7-6 |
| Challenger Kobe | 2019/11/05 04:15 | Jay Clarke v Ryota Tanuma | 6-3,3-6,6-3 |
| Challenger Kobe | 2019/11/04 06:30 | Ryota Tanuma v Takuto Niki | 6-3,4-6,7-6 |
| ITF M15 - Changwon | 2019/10/16 05:40 | Ryota Tanuma v Shintaro Mochizuki | 3-6,1-6 |
| ITF M15 - Nanchang | 2019/09/22 03:00 | Ryota Tanuma v Dusty H. Boyer | 6-3,6-4 |
| ITF M15 - Nanchang | 2019/09/21 04:55 | Makoto Ochi v Ryota Tanuma | 2-6,6-1,3-6 |