Ji Heon Im defeated Nam Hoon Kim 6-4 4-6 7-6 in the Korea Masters 4 round of 16 on clay. The upset overturned the form book — Nam Hoon Kim came in leading the head-to-head 1–0. Ji Heon Im claimed a first win over Nam Hoon Kim in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-05-20 | Korea Masters 1 | QF | clay | Nam Hoon Kim | 6-4 6-0 |