Yunseong Chung defeated Kuan Yi Lee 6-3 7-5 in the Thailand F1 round of 16 on hard. The upset overturned the form book — Kuan Yi Lee came in ranked #612, leading the head-to-head 2–1, but Yunseong Chung had been the form player, winning 7 of their last 10 on hard. Yunseong Chung narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-08-27 | M25 Taipei 2 | R32 | hard | Yunseong Chung | 4-6 7-5 7-6(2) |
| 2016-10-17 | Chinese Taipei F2 | QF | hard | Kuan Yi Lee | 6-0 6-2 |
| 2016-08-31 | Thailand F2 | R16 | hard | Kuan Yi Lee | 6-3 6-3 |
Averages over each player's completed matches in the selected window (200 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. About