Shiho Hisamatsu defeated Seiko Okamoto 6-4 6-1 in the Noto 25K round of 16 on carpet. The result followed the form book — Shiho Hisamatsu came in leading the head-to-head 5–0. Shiho Hisamatsu extended the head-to-head to 6–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-05-19 | Nagano 25K | QF | carpet | Shiho Hisamatsu | 6-3 6-3 |
| 2006-10-23 | Hamanako 25K | F | carpet | Shiho Hisamatsu | 6-2 6-4 |
| 2006-09-18 | Ibaraki 25K | QF | hard | Shiho Hisamatsu | 6-3 6-0 |
| 2006-07-03 | Nagoya 25K | SF | hard | Shiho Hisamatsu | 3-6 6-0 6-3 |
| 1998-11-16 | Haibara 10K | R32 | carpet | Shiho Hisamatsu | 6-1 6-1 |