Natsumi Hamamura defeated Shizu Katsumi 6-2 6-1 in the Hiroshima 10K round of 32 on carpet. The upset overturned the form book — Shizu Katsumi came in leading the head-to-head 1–0. Natsumi Hamamura claimed a first win over Shizu Katsumi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-10-20 | Tokyo 10K | R16 | hard | Shizu Katsumi | 6-1 6-3 |