Kyung Joo Won defeated Young Ja Choi 7-6 7-6 in the Jakarta 50K round of 32 on clay. The upset overturned the form book — Young Ja Choi came in leading the head-to-head 4–0. Kyung Joo Won claimed a first win over Young Ja Choi in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-03-29 | Inchon 10K | R32 | clay | Young Ja Choi | 6-2 6-3 |
| 1997-03-17 | Noda 25K | R32 | hard | Young Ja Choi | 6-4 6-0 |
| 1996-05-06 | Seoul II 25K | R32 | clay | Young Ja Choi | 6-4 6-2 |
| 1996-04-29 | Seoul I 25K | R16 | clay | Young Ja Choi | 6-0 6-2 |