Nam Hoon Kim defeated Yong Il Yoon 6-3 6-4 in the Korea Masters 4 qualifying round on clay. The upset overturned the form book — Yong Il Yoon came in leading the head-to-head 5–1. Nam Hoon Kim narrowed the head-to-head to 5–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-05-24 | Korea Masters 1 | F | clay | Yong Il Yoon | 7-5 6-1 |
| 1997-02-15 | Philippines Masters 2 | QF | hard | Yong Il Yoon | 6-3 7-6 |
| 1995-05-13 | Korea Masters 3 | R32 | hard | Nam Hoon Kim | 7-6 6-2 |
| 1994-02-07 | Philippines Masters 3 | R32 | clay | Yong Il Yoon | 6-4 3-6 6-2 |
| 1993-02-05 | Philippines Masters 1 | F | hard | Yong Il Yoon | 6-4 6-4 |
| 1993-02-05 | Philippines Masters 3 | QF | hard | Yong Il Yoon | 6-1 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.