
Naomi Osaka advanced when Heather Watson retired 6-1 4-1 in the Toronto round of 64. Naomi Osaka extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-04-21 | Fed Cup WG2 R1: GBR vs JPN | RR | hard | Naomi Osaka | 6-2 6-3 |
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 (196 vs 199). ATP, WTA & Challenger.