Mari Osaka defeated Kayla Day 6-3 6-4 in the W25 Pelham round of 32 on clay. The upset overturned the form book — Kayla Day came in leading the head-to-head 1–0. Mari Osaka claimed a first win over Kayla Day in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-02-23 | Rancho Santa Fe CA $25K | R32 | hard | Kayla Day | 4-6 6-2 6-2 |
Averages over each player's completed matches in the selected window (4 vs 149). 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