
Chieh Yu Hsu defeated Naomi Osaka 7-5 6-4 in the Monterrey 25K qualifying round on hard. The upset overturned the form book — Naomi Osaka came in leading the head-to-head 1–0. Chieh Yu Hsu claimed a first win over Naomi Osaka in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-05-27 | El Paso TX 25K | SF | hard | Naomi Osaka | 6-2 6-3 |
Averages over each player's completed matches in the selected window (18 vs 196). 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
Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About