Luksika Kumkhum defeated Ying Ying Duan 6-4 6-4 in the Incheon 25K qualifying round on hard. The upset overturned the form book — Ying Ying Duan came in leading the head-to-head 2–1, but Luksika Kumkhum had been the form player, winning 5 of their last 9 on hard. Luksika Kumkhum narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-09-10 | Hiroshima | R32 | hard | Luksika Kumkhum | 5-7 6-2 6-2 |
| 2012-09-17 | Guangzhou | R32 | hard | Ying Ying Duan | 6-2 6-1 |
| 2012-06-18 | Goyang 25K | R32 | hard | Ying Ying Duan | 2-6 7-5 6-0 |
Averages over each player's completed matches in the selected window (200 vs 160). 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