Stadium: Court 7 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/06/06 10:00 | Seita Watanabe v Connor Di Marco | 6-2,3-6,10-6 |
| ITF M15 Monastir | 2021/05/31 09:00 | Seita Watanabe v Emil Reinberg | 6-7,5-7 |
| ITF M15 Monastir | 2021/05/27 11:40 | Thomas Fancutt v Seita Watanabe | 7-6,4-6,6-2 |
| ITF M15 Monastir | 2021/05/26 09:30 | Seita Watanabe v Mauro De Maio | 6-3,6-3 |
| ITF M15 Monastir | 2021/05/24 12:30 | Savva Polukhin v Seita Watanabe | 6-7,2-6 |
| ITF M15 Monastir | 2021/05/24 08:00 | Luka Vukovic v Seita Watanabe | 6-4,4-6,6-10 |
| ITF M15 Monastir | 2021/05/19 12:25 | Luca Potenza v Seita Watanabe | 6-1,7-5 |
| ITF M15 Monastir | 2021/05/17 12:30 | Uisung Park v Seita Watanabe | 4-6,1-6 |
| ITF M15 Monastir | 2021/06/06 10:00 | Ji Hoon Son v Geun Jun Kim | 6-2,7-5 |
| Challenger Gwangju | 2019/05/14 03:30 | Yan Bai v Ji Hoon Son | 7-6,2-6,6-3 |
| Challenger Seoul | 2019/04/29 02:00 | Ji Sung Nam v Ji Hoon Son | 6-3,6-2 |
| ITF Korea F5 | 2018/08/24 01:15 | Ji Sung Nam v Ji Hoon Son | 6-4,6-2 |
| ITF Korea F5 | 2018/08/23 05:15 | Woo Hyeok Jang v Ji Hoon Son | 6-7,1-6 |
| ITF Korea F5 | 2018/08/21 01:00 | Ren Nakamura v Ji Hoon Son | 6-4,4-6,3-6 |
| Challenger Gwangju | 2018/08/14 06:30 | Bradley Mousley v Ji Hoon Son | 6-3,6-2 |
| Challenger Gwangju Qual | 2018/08/13 01:00 | Yuya Kibi v Ji Hoon Son | 3-6,4-6 |