Simon Touzil defeated Dong Wook Song 6-2 5-7 7-6 in the Philippines Thailand Masters 4 round of 16 on hard. The upset overturned the form book — Dong Wook Song came in leading the head-to-head 1–0. Simon Touzil claimed a first win over Dong Wook Song in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-02-09 | Philippines Thailand Masters 2 | QF | hard | Dong Wook Song | 7-6 7-5 |