Yasufumi Yamamoto defeated Hyung Taik Lee 7-6 7-5 in the Japan Masters 4 semi-final on hard. The upset overturned the form book — Hyung Taik Lee came in leading the head-to-head 1–0. Yasufumi Yamamoto claimed a first win over Hyung Taik Lee in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-03-17 | Japan F1 | QF | clay | Hyung Taik Lee | 6-1 6-0 |
Averages over each player's completed matches in the selected window (2 vs 200). 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. Small sample — read as indicative. About