Yong Il Yoon defeated Sang Hoon Lee 6-1 4-6 6-4 in the Korea Masters 1 semi-final on clay. The result followed the form book — Yong Il Yoon came in leading the head-to-head 6–1. Yong Il Yoon extended the head-to-head to 7–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-05-22 | Korea F1 | R16 | clay | Yong Il Yoon | 6-2 6-1 |
| 1998-05-25 | Korea F1 | R32 | hard | Yong Il Yoon | 6-2 6-1 |
| 1996-05-11 | Korea Masters 1 | SF | clay | Yong Il Yoon | 6-3 2-6 6-1 |
| 1996-05-11 | Korea Masters 2 | F | clay | Yong Il Yoon | 7-6 4-6 7-5 |
| 1995-05-13 | Korea Masters 2 | R16 | hard | Sang Hoon Lee | 6-4 6-4 |
| 1994-05-14 | Korea Masters 1 | QF | clay | Yong Il Yoon | 6-4 3-6 7-5 |
| 1993-02-05 | Philippines Masters 1 | QF | hard | Yong Il Yoon | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.