Ji Hoon Son defeated Yunseong Chung 7-6 0-6 7-6 in the Korea F2 round of 16 on hard. The upset overturned the form book — Yunseong Chung came in leading the head-to-head 2–0. Ji Hoon Son claimed a first win over Yunseong Chung in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-06-12 | Korea F3 | R32 | hard | Yunseong Chung | 7-6(4) 6-4 |
| 2015-08-17 | Korea F4 | R16 | hard | Yunseong Chung | 6-2 6-3 |
Averages over each player's completed matches in the selected window (77 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