Christoph Lessiak defeated Huai En Chang 6-7 6-3 7-6 in the Indonesia 1 3 round of 16 on hard. The upset overturned the form book — Huai En Chang came in leading the head-to-head 1–0. Christoph Lessiak claimed a first win over Huai En Chang in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-05-08 | Indonesia 1 1 | R32 | hard | Huai En Chang | 6-1 6-0 |