Rio Noguchi defeated Seong Chan Hong 3-6 6-4 6-0 in the Seoul CH round of 64 on hard. The upset overturned the form book — Seong Chan Hong came in leading the head-to-head 2–0, defending last year's round of 16, but Rio Noguchi had been the form player, winning 5 of their last 9 on hard. Rio Noguchi claimed a first win over Seong Chan Hong in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2022-06-05 | M25 Harmon 1 | F | hard | Seong Chan Hong | 6-3 6-2 |
| 2019-04-12 | M25 Matsuyama 1 | R16 | hard | Seong Chan Hong | 6-2 6-3 |
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.
Noguchi R.: 2 days rest · 2 matches, 52 games (7d) · Chan Hong S.: 2 days rest · 1 match, 17 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About