| ITF W50 Kofu | 2025/03/20 01:00 | Sohyun Park v Natsumi Kawaguchi | 6-0,6-4 |
| ITF W50 Kofu | 2025/03/19 04:30 | Natsumi Kawaguchi v Ayano Shimizu | 6-2,7-6 |
| ITF W50 Kofu | 2025/03/18 04:00 | Natsumi Kawaguchi v Kanako Morisaki | 6-2,2-6,6-2 |
| ITF W50 Kofu | 2025/03/17 03:37 | Natsumi Kawaguchi v Kanako Osafune | 6-3,6-2 |
| ITF W50 Kyoto | 2025/03/11 02:30 | Hayu Kinoshita v Natsumi Kawaguchi | 4-6,6-2,7-5 |
| ITF W50 Kyoto | 2025/03/10 08:00 | Natsumi Kawaguchi v Natsuki Yoshimoto | 6-1,6-2 |
| ITF W75 Brisbane | 2025/02/03 00:00 | Monique Barry v Natsumi Kawaguchi | 4-6,6-3,6-2 |
| ITF W75 Brisbane Qual | 2025/02/02 00:00 | Helena Guan v Natsumi Kawaguchi | 3-6,0-6 |