Tasuku Iwami defeated Jae Sung An 4-6 6-4 6-4 in the Japan F4 round of 16 on clay. The result followed the form book — Tasuku Iwami came in leading the head-to-head 2–0. Tasuku Iwami extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-03-17 | Japan F1 | R16 | hard | Tasuku Iwami | 7-5 3-6 6-4 |
| 2005-06-13 | Japan F6 | R16 | carpet | Tasuku Iwami | 6-4 6-4 |