Sara Saito leads 3 to 2 over 5 singles meetings since 2022. Last meeting on 15/01/2026 at W75 Nonthaburi.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 15/01/2026 | W75 Nonthaburi | Round 2 | hard | Kawaguchi | 2-6 6-4 6-3 |
| 25/09/2025 | W100 Incheon | Round 2 | hard | Saito | 6-4 6-4 |
| 09/04/2024 | W35 Osaka | Round 1 | hard | Saito | 4-6 1-6 |
| 12/05/2023 | W60 Fukuoka | Quarter-final | carpet | Kawaguchi | 6-1 6-7(4) 6-6 |
| 26/09/2022 | W25 Nanao | Qualifiers | carpet | Saito | 6-3 3-6 5-10 |
| hard | Kawaguchi 1 - 2 Saito |
| carpet | Kawaguchi 1 - 1 Saito |
| 2026 | Kawaguchi 1 - 0 Saito |
| 2025 | Kawaguchi 0 - 1 Saito |
| 2024 | Kawaguchi 0 - 1 Saito |
| 2023 | Kawaguchi 1 - 0 Saito |
| 2022 | Kawaguchi 0 - 1 Saito |
125 wins, 88 losses since 2021 (58.7%).
Last matches: D D D V D
124 wins, 90 losses since 2021 (57.9%).
Last matches: D D V V D
Sara Saito leads 3 to 2 over 5 singles meetings since 2022.
On 15/01/2026, at W75 Nonthaburi (Round 2): Natsumi Kawaguchi won 2-6 6-4 6-3.