Jae Sung An defeated Chul Hee Lee 6-2 6-2 in the Thailand F2 qualifying round on hard. The result followed the form book — Jae Sung An came in leading the head-to-head 2–1. Jae Sung An extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-06 | Korean Rep F1 | R16 | hard | Chul Hee Lee | 7-5 6-3 |
| 2007-05-07 | Korea Rep F3 | R32 | hard | Jae Sung An | 6-2 6-2 |
| 2006-06-19 | Japan F7 | R16 | carpet | Jae Sung An | 6-4 6-3 |