Mi Yoo defeated Seiko Okamoto 6-3 6-1 in the Miyazaki 25K round of 32 on carpet. The upset overturned the form book — Seiko Okamoto came in leading the head-to-head 3–0. Mi Yoo claimed a first win over Seiko Okamoto in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-10-30 | Sutama 25K | QF | clay | Seiko Okamoto | 6-0 7-5 |
| 2006-10-23 | Hamanako 25K | R16 | carpet | Seiko Okamoto | 6-1 6-3 |
| 2005-05-16 | Changwon 25K | QF | hard | Seiko Okamoto | 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.