Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF - W60 Fukuoka | 2023/05/12 03:35 | Sara Saito v Natsumi Kawaguchi | 6-1,6-7,6-7 |
| ITF - W25 Nanao | 2022/09/26 00:50 | Natsumi Kawaguchi v Sara Saito | 6-3,3-6,5-10 |
| ITF - W50 Kashiwa | 2024/04/01 05:55 | Natsumi Kawaguchi v Miho Kuramochi | 2-6,3-6 |
| ITF - W50 Kofu | 2024/03/27 00:30 | Natsumi Kawaguchi v Ikumi Yamazaki | 4-6,6-2,2-6 |
| ITF - W15 Hinode | 2024/03/21 01:00 | Kayo Nishimura v Natsumi Kawaguchi | 2-6,6-2,6-0 |
| ITF - W15 Hinode | 2024/03/19 01:00 | Mio Mushika v Natsumi Kawaguchi | 4-6,7-6,4-6 |
| ITF - W40 Yokohama | 2023/11/30 01:00 | Natsumi Kawaguchi v Mai Hontama | 4-6,3-6 |
| ITF - W40 Yokohama | 2023/11/29 02:45 | Natsumi Kawaguchi v En Shuo Liang | 7-6,6-4 |
| ITF - W100 Takasaki | 2023/11/20 02:30 | Luksika Kumkhum v Natsumi Kawaguchi | 6-3,4-6,7-5 |
| ITF - W100 Takasaki | 2023/11/13 07:25 | Sijia Wei v Natsumi Kawaguchi | 7-5,6-0 |
| ITF - W50 Kashiwa | 2024/04/04 01:30 | Arianne Hartono v Sara Saito | 6-3,6-1 |
| ITF - W50 Kashiwa | 2024/04/02 00:55 | Lea Ma v Sara Saito | 1-6,6-7 |
| ITF - W50 Kofu | 2024/03/29 04:20 | Sara Saito v Ya-Hsuan Lee | 2-6,6-4,4-6 |
| ITF - W50 Kofu | 2024/03/28 00:55 | Hanna Chang v Sara Saito | 5-7,3-6 |
| ITF - W50 Kofu | 2024/03/27 02:10 | Sara Saito v Ena Shibahara | 6-2,6-2 |
| ITF - W75 Burnie | 2024/02/09 23:30 | Sara Saito v Aoi Ito | 6-3,2-6,3-6 |
| ITF - W75 Burnie | 2024/02/08 23:00 | Sara Saito v Petra Hule | 4-6,6-1,6-3 |
| ITF - W75 Burnie | 2024/02/07 23:00 | Sara Saito v Ena Shibahara | 7-6,6-3 |