Nam Hoon Kim defeated Ji Heon Im 6-4 6-0 in the Korea Masters 1 qualifying round on clay. The upset overturned the form book — Ji Heon Im came in leading the head-to-head 1–0. Nam Hoon Kim claimed a first win over Ji Heon Im in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-05-20 | Korea Masters 4 | R16 | clay | Ji Heon Im | 6-4 4-6 7-6 |