Cheong Eui Kim defeated Ji Sung Nam 6-3 7-5 in the Korea F4 semi-final on hard. The upset overturned the form book — Ji Sung Nam came in leading the head-to-head 4–2. Cheong Eui Kim narrowed the head-to-head to 4–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-07-04 | Korea F4 | QF | hard | Ji Sung Nam | 6-3 6-3 |
| 2016-06-20 | Korea F2 | SF | hard | Ji Sung Nam | 6-3 6-3 |
| 2015-05-25 | Korea F2 | R16 | hard | Ji Sung Nam | 6-2 6-3 |
| 2014-04-28 | Korea F2 | R16 | hard | Ji Sung Nam | 6-1 5-7 6-2 |
| 2013-06-17 | Korea F7 | SF | hard | Cheong Eui Kim | 3-6 6-0 7-5 |
| 2013-06-03 | Korea F5 | QF | hard | Cheong Eui Kim | 4-6 6-0 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.