Yurina Koshino defeated Sakiko Shimizu 6-2 6-2 in the Miyazaki 10K round of 32 on carpet. The upset overturned the form book — Sakiko Shimizu came in leading the head-to-head 3–0. Yurina Koshino claimed a first win over Sakiko Shimizu in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-09-12 | Kyoto 10K | R16 | carpet | Sakiko Shimizu | 3-6 6-3 6-2 |
| 2008-07-07 | Tokyo 10K | R32 | carpet | Sakiko Shimizu | 7-5 3-6 6-2 |
| 2006-08-28 | Saitama 10K | R32 | hard | Sakiko Shimizu | 2-6 7-6(1) 6-2 |