Issei Okamura defeated Duck Hee Lee 6-2 3-6 7-5 in the M15 Changwon 1 round of 16 on hard. The upset overturned the form book — Duck Hee Lee came in ranked #977, leading the head-to-head 2–0. Issei Okamura 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 |
|---|---|---|---|---|---|
| 2022-08-31 | M15 Daegu 1 | R32 | hard | Duck Hee Lee | 5-7 6-1 6-3 |
| 2015-06-08 | Japan F6 | R16 | hard | Duck Hee Lee | 6-1 6-4 |
Averages over each player's completed matches in the selected window (103 vs 161). 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