Momoko Kobori defeated Natsumi Kawaguchi 3-6 6-2 6-3 in the W25 Yokohama round of 16 on hard. The upset overturned the form book — Natsumi Kawaguchi came in leading the head-to-head 1–0. Momoko Kobori claimed a first win over Natsumi Kawaguchi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-03 | W35 Nakhon Pathom 3 | R32 | hard | Natsumi Kawaguchi | 6-4 6-3 |
Averages over each player's completed matches in the selected window (189 vs 199). 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