Stadium: Court 4 Round: 26 Ground: Hardcourt outdoor
| ITF W15 Fukui | 2023/04/26 06:50 | Honori Koyama v Rinon Okuwaki | 2-6,2-6 |
| ITF W15 Fukui | 2023/04/25 01:00 | Rinon Okuwaki v Nagomi Higashitani | 7-6,6-1 |
| ITF W15 Fukui | 2023/04/24 02:00 | Rinon Okuwaki v Miyu Nakashima | 6-2,6-0 |
| ITF W25 Osaka | 2023/04/18 01:00 | Rinon Okuwaki v Mio Mushika | 2-6,0-6 |
| ITF W25 Osaka | 2023/04/17 02:00 | Honoka Kobayashi v Rinon Okuwaki | 3-6,6-1,7-10 |
| ITF W25 Osaka | 2023/04/10 01:00 | Rinon Okuwaki v Georgina Garcia-Perez | 4-6,6-4,6-10 |
| ITF W25 Osaka | 2023/04/09 03:00 | Rinon Okuwaki v Kanako Osafune | 6-1,6-2 |
| ITF W25 Kashiwa | 2023/04/02 00:30 | Rinon Okuwaki v Georgina Garcia-Perez | 3-6,4-6 |
| ITF W15 Fukui | 2023/04/25 02:00 | Chihiro Takayama v Riko Sawayanagi | 5-7,0-6 |
| ITF W25 Osaka | 2023/04/12 09:30 | Xiaodi You v Riko Sawayanagi | 6-1,6-1 |
| ITF W25 Osaka | 2023/04/10 04:50 | Gyeong Seo Lee v Riko Sawayanagi | 4-6,2-6 |
| ITF W25 Osaka | 2023/04/10 01:00 | Ai Yamaguchi v Riko Sawayanagi | 2-6,4-6 |
| ITF W25 Osaka | 2023/04/09 01:00 | Ayaka Ozeki v Riko Sawayanagi | 0-6,0-6 |
| ITF W60 Canberra | 2023/03/21 03:00 | Riko Sawayanagi v Dalila Jakupovic | 2-6,2-6 |
| ITF W60 Canberra | 2023/03/20 00:25 | Ya-Yi Yang v Riko Sawayanagi | 6-3,0-6,1-6 |
| ITF W60 Canberra Qual | 2023/03/18 23:00 | Sophia Fry v Riko Sawayanagi | 0-6,0-6 |