Sang Woo Noh defeated Ku Keon Kang 7-5 7-6 in the Korea F1 round of 16 on hard. The upset overturned the form book — Ku Keon Kang came in leading the head-to-head 1–0. Sang Woo Noh claimed a first win over Ku Keon Kang in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-06-26 | Korea F5 | R32 | clay | Ku Keon Kang | 3-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.