Seong Gook Oh defeated Sung Jun Park 6-4 2-6 6-4 in the Korea F4 qualifying round of 64 on hard. The upset overturned the form book — Sung Jun Park came in leading the head-to-head 1–0. Seong Gook Oh claimed a first win over Sung Jun Park in two meetings, levelling the head-to-head at 1–1.
Gook Oh S. came through in three sets.
Seong Gook Oh beat Sung Jun Park 6-4 2-6 6-4. Umpiry, "Seong Gook Oh vs Sung Jun Park — Korea F4 Qualifying Round of 64", https://umpiry.com/match/2015-08-17/oh-vs-park-korea-f4-q64?utm_source=cite (as of 17 August 2015).