Yong Il Yoon defeated Jong Sam Chung 6-3 7-6 in the Indonesia F1 qualifying round on hard. The result followed the form book — Yong Il Yoon came in leading the head-to-head 6–0. Yong Il Yoon extended the head-to-head to 7–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2002-05-20 | Korea Rep F2 | R16 | clay | Yong Il Yoon | 6-1 6-0 |
| 2002-05-13 | Korea Rep F1 | R16 | clay | Yong Il Yoon | 6-0 4-6 6-2 |
| 1997-05-24 | Korea Masters 2 | SF | clay | Yong Il Yoon | 6-2 6-4 |
| 1997-02-15 | Philippines Masters 2 | SF | hard | Yong Il Yoon | 6-0 6-3 |
| 1996-05-11 | Korea Masters 1 | QF | clay | Yong Il Yoon | 6-3 6-4 |
| 1993-02-05 | Philippines Masters 4 | QF | hard | Yong Il Yoon | 6-1 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.