Montinee Tangphong defeated Shiho Hisamatsu 7-6 6-4 in the Tsukuba 25K round of 32 on hard. The upset overturned the form book — Shiho Hisamatsu came in leading the head-to-head 1–0. Montinee Tangphong claimed a first win over Shiho Hisamatsu in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-04-25 | Hamanako 25K | R16 | carpet | Shiho Hisamatsu | 6-4 6-0 |