Rina Saigo defeated Sayaka Ishii 6-4 6-3 in the W100 Gifu qualifying round of 16 on hard. The upset overturned the form book — Sayaka Ishii came in leading the head-to-head 1–0, defending last year's round of 32. Rina Saigo claimed a first win over Sayaka Ishii in two meetings, levelling the head-to-head at 1–1.
Saigo R. took it in straight sets.
Rina Saigo beat Sayaka Ishii 6-4 6-3. Umpiry, "Rina Saigo vs Sayaka Ishii — W100 Gifu Qualifying Round of 16", https://umpiry.com/match/2026-04-28/ishii-vs-saigo-w100-gifu-q16?utm_source=cite (as of 28 April 2026).