Kyung Mi Chang defeated Kyung Yee Chae 2-6 6-2 6-2 in the Kofu 10K qualifying round on hard. The upset overturned the form book — Kyung Yee Chae came in leading the head-to-head 4–3, but Kyung Mi Chang had been the form player, winning 3 of their last 7 on hard. Kyung Mi Chang narrowed the head-to-head to 4–4.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-08-25 | Gimhae 10K | SF | hard | Kyung Yee Chae | 1-6 6-4 6-2 |
| 2003-06-02 | Seoul 25K | R32 | hard | Kyung Yee Chae | 6-2 6-2 |
| 2002-07-22 | Inchon 10K | QF | hard | Kyung Mi Chang | 6-3 6-3 |
| 2002-07-15 | Seoul 10K | F | hard | Kyung Mi Chang | 4-6 6-3 6-1 |
| 2000-09-18 | Kyoto 10K | SF | carpet | Kyung Mi Chang | 6-2 1-6 6-3 |
| 2000-06-05 | Inchon 10K | QF | hard | Kyung Yee Chae | 6-3 6-3 |
| 1999-03-29 | Inchon 10K | R32 | clay | Kyung Yee Chae | 7-5 7-6 |