Shiho Hisamatsu defeated Natsumi Hamamura 2-6 6-0 7-6 in the Sutama 25K round of 16 on clay. The upset overturned the form book — Natsumi Hamamura came in leading the head-to-head 1–0. Shiho Hisamatsu claimed a first win over Natsumi Hamamura in two meetings, levelling the head-to-head at 1–1.
Hisamatsu S. came through in three sets.
Shiho Hisamatsu beat Natsumi Hamamura 2-6 6-0 7-6(4). Umpiry, "Shiho Hisamatsu vs Natsumi Hamamura — Sutama 25K Round of 16", https://umpiry.com/match/2006-10-30/hamamura-vs-hisamatsu-sutama-25k-r16?utm_source=cite (as of 30 October 2006).