Owen Casey defeated Eui Jong Chang 6-1 1-6 6-4 in the Malaysia 2 Masters 3 round of 32 on hard. The upset overturned the form book — Eui Jong Chang came in leading the head-to-head 1–0. Owen Casey claimed a first win over Eui Jong Chang in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-02-09 | Philippines Thailand Masters 2 | R16 | hard | Eui Jong Chang | 7-5 1-6 6-1 |