Natsumi Hamamura defeated Seiko Okamoto 1-6 7-6 6-1 in the Gunma 25K semi-final on carpet. The upset overturned the form book — Seiko Okamoto came in leading the head-to-head 2–0, but Natsumi Hamamura had been the form player, winning 3 of their last 6 on carpet. Natsumi Hamamura claimed a first win over Seiko Okamoto in three meetings, narrowing the head-to-head to 2–1.
Hamamura N. came through in three sets.
Carpet: Hamamura N. leads 1–0 · Hard: Okamoto S. leads 2–0
Natsumi Hamamura beat Seiko Okamoto 1-6 7-6(6) 6-1. Umpiry, "Natsumi Hamamura vs Seiko Okamoto — Gunma 25K Semi-final", https://umpiry.com/match/2007-05-28/hamamura-vs-okamoto-gunma-25k-sf?utm_source=cite (as of 28 May 2007).