Jumpei Yamasaki defeated Duck Hee Lee 6-1 4-6 6-4 in the M25 Daegu 1 round of 32 on hard. The upset overturned the form book — Duck Hee Lee came in ranked #977, leading the head-to-head 2–0, but Jumpei Yamasaki had been the form player, winning 6 of their last 10 on hard. Jumpei Yamasaki claimed a first win over Duck Hee Lee in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-12-30 | M15 Yanagawa 2 | SF | hard | Duck Hee Lee | 6-1 3-6 6-1 |
| 2023-06-13 | M25 Changwon 1 | R32 | hard | Duck Hee Lee | 6-0 1-0 |
Averages over each player's completed matches in the selected window (80 vs 120). 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