Stadium: Center Court Round: 45 Ground: Hardcourt outdoor
| Challenger Yokkaichi | 2023/11/28 05:45 | Yuki Mochizuki v Geoffrey Blancaneaux | 0-6,4-6 |
| Challenger Yokkaichi | 2023/11/27 01:00 | Yusuke Takahashi v Yuki Mochizuki | 6-2,3-6,7-6 |
| Challenger Yokkaichi | 2023/11/26 01:00 | Yannik Steinegger v Yuki Mochizuki | 3-6,2-6 |
| Challenger Yokohama | 2023/11/19 03:20 | Omar Jasika v Yuki Mochizuki | 6-0,7-6 |
| Challenger Matsuyama | 2023/11/05 01:00 | Yuki Mochizuki v James Trotter | 7-6,3-6,1-6 |
| ITF M25 Sapporo | 2023/09/16 01:00 | Kazuki Nishiwaki v Yuki Mochizuki | 6-1,6-3 |
| ITF M25 Sapporo | 2023/09/15 02:55 | Tomohiro Masabayashi v Yuki Mochizuki | 6-2,4-6,1-6 |
| ITF M25 Sapporo | 2023/09/13 03:05 | Collin Altamirano v Yuki Mochizuki | 6-7,4-6 |
| ITF M15 Yanagawa | 2023/12/27 00:30 | Seita Watanabe v Duckhee Lee | 1-6,6-7 |
| ITF M15 Yanagawa | 2023/12/22 05:10 | Masamichi Imamura v Seita Watanabe | 3-6,6-4,6-3 |
| ITF M15 Yanagawa | 2023/12/21 03:55 | Seita Watanabe v Shu Matsuoka | 7-5,6-4 |
| ITF M15 Yanagawa | 2023/12/20 02:30 | Seita Watanabe v Hayato Matsuoka | 7-5,6-2 |
| ITF M25 Kalaburagi | 2023/12/01 04:00 | David Pichler v Seita Watanabe | 6-2,6-0 |
| ITF M25 Kalaburagi | 2023/11/30 07:45 | Seita Watanabe v Rishi Reddy | 6-2,6-3 |
| ITF M25 Mumbai | 2023/11/22 03:30 | Seita Watanabe v Louis Wessels | 4-6,5-7 |
| ITF M25 Takasaki | 2023/09/20 01:00 | Naoki Nakagawa v Seita Watanabe | 6-3,6-2 |