Sakiko Shimizu defeated Ayaka Maekawa 3-6 6-4 6-3 in the Tokyo 10K round of 32 on hard. The upset overturned the form book — Ayaka Maekawa came in leading the head-to-head 4–0. Sakiko Shimizu claimed a first win over Ayaka Maekawa in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-09-27 | Hamanako 25K | R32 | carpet | Ayaka Maekawa | 3-6 6-1 6-2 |
| 2008-09-15 | Kyoto 10K | R16 | carpet | Ayaka Maekawa | 6-4 6-4 |
| 2008-02-25 | Wellington 10K | R32 | hard | Ayaka Maekawa | 6-2 6-1 |
| 2007-10-29 | Kofu 10K | QF | hard | Ayaka Maekawa | 6-0 6-4 |