Seo Hyeon Jang defeated Sihyeong Cho 6-0 1-6 10-6 in the W15 Yeongwol 2 q64 on hard. The upset overturned the form book — Sihyeong Cho came in leading the head-to-head 2–0. Seo Hyeon Jang claimed a first win over Sihyeong Cho in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-08-04 | W15 Singapore 1 | Q16 | hard | Sihyeong Cho | 6-3 6-2 |
| 2024-09-22 | W15 Yeongwol 1 | Q64 | hard | Sihyeong Cho | 6-2 6-3 |
Averages over each player's completed matches in the selected window (1 vs 11). 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. Small sample — read as indicative. About