Sachie Umehara defeated Shiho Hisamatsu 6-1 6-3 in the Kugayama 4 10K quarter-final on hard. The upset overturned the form book — Shiho Hisamatsu came in leading the head-to-head 1–0. Sachie Umehara claimed a first win over Shiho Hisamatsu in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-09-04 | Ibaraki 10K | QF | hard | Shiho Hisamatsu | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.