Erina Hayashi defeated Momoko Kobori 7-5 6-2 in the W25 Hong Kong quarter-final on hard. The upset overturned the form book — Momoko Kobori came in leading the head-to-head 2–0. Erina Hayashi claimed a first win over Momoko Kobori in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-08-22 | W25 Tsukuba | R16 | hard | Momoko Kobori | 7-6(8) 7-5 |
| 2019-05-25 | W25 Karuizawa | SF | carpet | Momoko Kobori | 6-4 6-3 |
Averages over each player's completed matches in the selected window (1 vs 50). 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. Small sample — read as indicative. About