

Sloane Stephens defeated Naomi Osaka 7-5 4-6 6-1 in the Singapore round robin on hard. The upset overturned the form book — Naomi Osaka came in ranked #13. Sloane Stephens extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2022-03-07 | Indian Wells | R128 | hard | Naomi Osaka | 3-6 6-1 6-2 |
| 2016-02-22 | Acapulco | QF | hard | Sloane Stephens | 6-3 7-5 |
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
Averages over each player's completed matches in the selected window (200 vs 196). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Osaka N.: 6 days rest · 1 match, 23 games (7d). Higher means fresher. About