Yohei Ono defeated Hiromasa Oku 6-2 6-1 in the Japan F5 qualifying round on clay. The result followed the form book — Yohei Ono came in leading the head-to-head 1–0. Yohei Ono extended the head-to-head to 2–0.
Ono Y. took it in straight sets.
Clay: Ono Y. leads 1–0 · Grass: Ono Y. leads 1–0
Yohei Ono beat Hiromasa Oku 6-2 6-1. Umpiry, "Yohei Ono vs Hiromasa Oku — Japan F5 Qualifying Round", https://umpiry.com/match/2013-06-10/oku-vs-ono-japan-f5-qf?utm_source=cite (as of 10 June 2013).