Ayumi Oka defeated Yuka Higuchi 6-4 2-6 6-2 in the Tokyo 10K round of 16 on hard. The result followed the form book — Ayumi Oka came in leading the head-to-head 1–0. Ayumi Oka extended the head-to-head to 2–0.
Oka A. came through in three sets.
Ayumi Oka beat Yuka Higuchi 6-4 2-6 6-2. Umpiry, "Ayumi Oka vs Yuka Higuchi — Tokyo 10K Round of 16", https://umpiry.com/match/2011-06-06/higuchi-vs-oka-tokyo-10k-r16?utm_source=cite (as of 6 June 2011).