Keiko Nagatomi defeated Yoon Jeong Cho 3-6 6-4 6-0 in the Gifu 50K round of 32 on carpet. The upset overturned the form book — Yoon Jeong Cho came in leading the head-to-head 1–0. Keiko Nagatomi claimed a first win over Yoon Jeong Cho in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-09-27 | Seoul 50K | R32 | hard | Yoon Jeong Cho | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.