Seong Yoon Chung defeated Guilherme Ochiai 6-3 7-5 in the Japan F7 qualifying round on clay. The result followed the form book — Seong Yoon Chung came in leading the head-to-head 2–0. Seong Yoon Chung extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-06-12 | Japan F6 | R32 | clay | Seong Yoon Chung | 6-3 6-3 |
| 2005-08-15 | Indonesia F3 | QF | hard | Seong Yoon Chung | 6-2 6-3 |