Round: 28 Ground: Hardcourt outdoor
| UTR Pro Yokohama Women | 2024/09/15 02:49 | Ayaka Kanai v Rira Kosaka | 4-6,3-6 |
| UTR Pro Yokohama Women | 2024/09/10 04:08 | Rira Kosaka v Yuka Matsumoto | 6-3,2-6,6-4 |
| ITF W15 Sapporo | 2024/07/31 05:10 | Hayu Kinoshita v Rira Kosaka | 4-6,6-1,6-4 |
| ITF W15 Sapporo | 2024/07/30 04:30 | Rira Kosaka v Aely Arai | 7-6,6-2 |
| ITF W15 Sapporo | 2024/07/30 01:00 | Mei Hasegawa v Rira Kosaka | 3-6,5-7 |
| ITF W15 Sapporo | 2024/07/22 10:00 | Rira Kosaka v Kanna Soeda | 1-6,7-5,5-10 |