| UTR Pro Kawaguchi | 2024/06/19 07:40 | Christopher Kosei Ono v Payton Jim on | 6-1,5-0 |
| UTR Pro Kawaguchi | 2024/06/19 01:30 | Christopher Kosei Ono v Hikaru Shiraishi | 1-6,1-6 |
| UTR Pro Kawaguchi | 2024/06/17 00:00 | Taiyo Kurata v Christopher Kosei Ono | 4-6,6-1,6-7 |
| UTR Pro Urayasu | 2024/05/11 03:15 | Kotaro Mochizuki v Christopher Kosei Ono | 6-3,6-4 |
| UTR Pro Urayasu | 2024/05/10 00:00 | Yusuke Yoshikawa v Christopher Kosei Ono | 6-1,7-6 |
| UTR Pro Urayasu | 2024/05/08 03:30 | Yuki Mochizuki v Christopher Kosei Ono | 4-6,6-2,6-2 |
| UTR Pro Urayasu | 2024/05/06 04:30 | Hamish Bartos v Christopher Kosei Ono | 5-7,3-6 |
| UTR Pro Kawaguchi | 2024/03/09 00:00 | Rei Sato v Christopher Kosei Ono | 3-6,7-6,6-7 |
| UTR Pro Kawaguchi | 2024/06/20 01:30 | Hikaru Shiraishi v Seiya Nakanishi | 6-4,4-6,7-5 |
| UTR Pro Kawaguchi | 2024/06/19 00:00 | Taiyo Kurata v Seiya Nakanishi | 3-6,4-6 |
| UTR Pro Kawaguchi | 2024/06/17 02:41 | Seiya Nakanishi v Payton Jim on | 6-0,6-3 |
| ITF M15 Harmon | 2024/06/03 00:00 | Geni Inoue v Seiya Nakanishi | 6-1,6-1 |
| ITF M15 Harmon | 2024/06/02 00:00 | Babji Siva Atturu v Seiya Nakanishi | 1-6,2-6 |
| UTR Pro Urayasu | 2024/05/11 00:00 | Yuki Mochizuki v Seiya Nakanishi | 6-4,6-4 |
| UTR Pro Urayasu | 2024/05/09 03:00 | Kazuki Saito v Seiya Nakanishi | 4-6,2-6 |
| UTR Pro Urayasu | 2024/05/09 01:30 | Hiiro Sakamoto v Seiya Nakanishi | 7-6,7-6 |