Ayano Shimizu defeated Momoko Kobori 6-3 7-6 in the W50 Nanao 1 quarter-final on carpet. The upset overturned the form book — Momoko Kobori came in ranked #346, leading the head-to-head 3–1. Ayano Shimizu narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-11-05 | W35 Hamamatsu 1 | R32 | carpet | Momoko Kobori | 6-4 7-5 |
| 2025-06-27 | W35 Taipei 2 | QF | hard | Momoko Kobori | 6-3 3-6 6-4 |
| 2025-04-05 | W15 Kashiwa 1 | QF | hard | Ayano Shimizu | 2-6 6-0 6-3 |
| 2024-03-21 | W15 Hinode 1 | R16 | hard | Momoko Kobori | 6-7(5) |
Averages over each player's completed matches in the selected window (56 vs 46). 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