Stadium: Court 3 Round: 14 Ground: Clay
| UTR Pro Miki | 2023/02/10 04:30 | Ren Nakamura v Seita Watanabe | 5-7,2-6 |
| ITF M25 Taipei | 2019/07/16 03:50 | Ren Nakamura v Seita Watanabe | 6-4,4-6,5-10 |
| 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 |
| ITF M25 Takasaki | 2023/09/18 03:30 | Mitsuki Wei Kang Leong v Seita Watanabe | 4-6,4-6 |
| ITF M25 Sapporo | 2023/09/15 00:55 | Naoki Nakagawa v Seita Watanabe | 6-3,6-2 |
| ITF M25 Sapporo | 2023/09/13 03:00 | Seita Watanabe v Yuta Kikuchi | 6-1,6-3 |
| ITF M25 Sapporo | 2023/09/06 03:35 | Seita Watanabe v Tatsuma Ito | 6-4,4-6,4-6 |
| ITF M15 Kuala Lumpur | 2023/11/27 01:30 | Mattias Southcombe v Ren Nakamura | 6-3,3-6,10-3 |
| ITF M15 Ipoh Perak | 2023/11/20 01:30 | Ren Nakamura v Chien Hsun Lo | 6-3,3-6,7-10 |
| ITF M15 Kuching | 2023/11/16 03:25 | Ren Nakamura v Taiyo Yamanaka | 1-6,0-6 |
| ITF M15 Kuching | 2023/11/15 03:30 | Jimmy Yang v Ren Nakamura | 2-6,4-6 |
| ITF M15 Kuching | 2023/11/14 02:30 | Tanguy Genier v Ren Nakamura | 4-6,4-6 |
| ITF M15 Kuching | 2023/11/13 04:00 | Ren Nakamura v Ryuhei Azuma | 6-2,6-4 |
| ITF M25 Takasaki | 2023/09/17 05:00 | Hayato Matsuoka v Ren Nakamura | 6-1,7-5 |
| ITF M25 Hong Kong Qual | 2023/09/04 02:00 | Collin Altamirano v Ren Nakamura | 6-4,6-1 |