Ji Sung Nam defeated Sang Woo Noh 6-3 6-3 in the Korea F4 round of 16 on hard. The upset overturned the form book — Sang Woo Noh came in leading the head-to-head 2–1, but Ji Sung Nam had been the form player, winning 6 of their last 7 on hard. Ji Sung Nam narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-06-20 | Korea F2 | F | hard | Sang Woo Noh | 6-4 6-1 |
| 2015-05-18 | Korea F1 | R32 | hard | Ji Sung Nam | 6-2 6-4 |
| 2012-05-21 | China F8 | R32 | hard | Sang Woo Noh | 7-5 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.