Young Jun Kim defeated Daniel Yoo 6-1 6-4 in the Korea F1 qualifying round on hard. The result followed the form book — Young Jun Kim came in leading the head-to-head 1–0. Young Jun Kim extended the head-to-head to 2–0.
Kim Y. took it in straight sets.
Young Jun Kim beat Daniel Yoo 6-1 6-4. Umpiry, "Young Jun Kim vs Daniel Yoo — Korea F1 Qualifying Round", https://umpiry.com/match/2011-05-16/kim-vs-yoo-korea-f1-qf?utm_source=cite (as of 16 May 2011).