Huai En Chang defeated Christoph Lessiak 6-1 6-0 in the Indonesia 1 1 round of 32 on hard. The upset overturned the form book — Christoph Lessiak came in leading the head-to-head 1–0. Huai En Chang claimed a first win over Christoph Lessiak in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-05-08 | Indonesia 1 3 | R16 | hard | Christoph Lessiak | 6-7(1) 6-3 7-6(4) |