Yong Il Yoon defeated Tetsuya Chaen 6-2 6-1 in the Japan Masters 3 qualifying round on hard. The result followed the form book — Yong Il Yoon came in leading the head-to-head 2–0. Yong Il Yoon extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-07-26 | USA F12 | QF | hard | Yong Il Yoon | 6-2 6-2 |
| 1997-04-07 | Malaysia 1 Masters 2 | R32 | hard | Yong Il Yoon | 6-1 6-4 |
Averages over each player's completed matches in the selected window (8 vs 2). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About