Sang Oh Oh defeated Woong Sun Jun 2-6 7-5 6-3 in the Korea F1 qualifying round of 16 on hard. The upset overturned the form book — Woong Sun Jun came in leading the head-to-head 2–0, but Sang Oh Oh had been the form player, winning 2 of their last 5 on hard. Sang Oh Oh claimed a first win over Woong Sun Jun in three meetings, narrowing the head-to-head to 2–1.
Oh Oh S. came through in three sets.
Sang Oh Oh beat Woong Sun Jun 2-6 7-5 6-3. Umpiry, "Sang Oh Oh vs Woong Sun Jun — Korea F1 Qualifying Round of 16", https://umpiry.com/match/2015-05-18/jun-vs-oh-korea-f1-q16?utm_source=cite (as of 18 May 2015).