Ji Hoon Son defeated Ji Sung Nam 4-6 7-6 6-1 in the Turkey F5 round of 32 on clay. Ji Hoon Son extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-05-14 | Vietnam F3 | SF | hard | Ji Sung Nam | 6-1 6-2 |
| 2013-05-06 | Korea F2 | R32 | hard | Ji Hoon Son | 6-7(3) 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.