Sang Oh Oh defeated Seong Gook Oh 3-6 6-4 6-3 in the Korea F6 q16 on hard. The upset overturned the form book — Seong Gook Oh came in leading the head-to-head 1–0, but Sang Oh Oh had been the form player, winning 2 of their last 4 on hard. Sang Oh Oh claimed a first win over Seong Gook Oh in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-08-24 | Korea F5 | Q16 | hard | Seong Gook Oh | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.