Estadio: Court 6 Round: 54 Ground: Hardcourt outdoor
| ITF W25 Karuizawa | 2023/05/24 04:35 | Rinon Okuwaki v Natsumi Kawaguchi | 0-6,4-6 |
| ITF W40 Nanao | 2023/09/26 04:25 | Rinon Okuwaki v Chia Yi Tsao | 0-6,0-6 |
| ITF W25 Kioto | 2023/09/18 00:00 | Rinko Matsuda v Rinon Okuwaki | 6-1,6-3 |
| ITF W25 Kioto | 2023/09/17 01:00 | Moeka Miyata v Rinon Okuwaki | 6-4,1-6,9-11 |
| ITF W15 Yeongwol | 2023/09/05 05:25 | Rinon Okuwaki v Sunam Jeong | 2-6,1-6 |
| ITF W15 Sapporo | 2023/08/09 02:30 | Rinon Okuwaki v BoYoung Jeong | 4-6,2-6 |
| ITF W15 Sapporo | 2023/08/06 05:00 | Rinon Okuwaki v Thasaporn Naklo | 2-6,3-6 |
| ITF W15 Sapporo | 2023/08/05 01:00 | Rinon Okuwaki v Kayo Nishimura | 3-6,6-1,6-1 |
| ITF W15 Sapporo | 2023/08/04 00:55 | Funa Kozaki v Rinon Okuwaki | 4-6,5-7 |
| ITF W60 Sydney | 2023/10/30 23:00 | Yuki Naito v Natsumi Kawaguchi | 7-5,7-5 |
| ITF W60 Playford | 2023/10/25 01:10 | Natsumi Kawaguchi v Jaimee Fourlis | 6-3,5-7,1-6 |
| ITF W25 Hamamatsu | 2023/10/12 02:45 | Natsumi Kawaguchi v Saki Imamura | 1-6,2-6 |
| ITF W25 Hamamatsu | 2023/10/10 03:40 | Natsumi Kawaguchi v Nana Kawagishi | 6-3,5-7,6-2 |
| WTA Tokio | 2023/09/24 02:35 | Himeno Sakatsume v Natsumi Kawaguchi | 6-7,4-6 |
| WTA Tokio | 2023/09/23 05:25 | Bibiane Schoofs v Natsumi Kawaguchi | 4-6,3-6 |
| ITF W25 Kioto | 2023/09/20 00:50 | Natsumi Kawaguchi v Akiko Omae | 1-6,6-4,1-6 |
| WTA Osaka | 2023/09/09 06:55 | Himeno Sakatsume v Natsumi Kawaguchi | 6-3,6-3 |